Automated Resyntax fixes (#696)

* Automated Resyntax fixes

This is an automated change generated by Resyntax.

#### Pass 1

Applied 1 fix to [`drracket/drracket/private/in-irl-namespace.rkt`](../blob/HEAD/drracket/drracket/private/in-irl-namespace.rkt)

  * Line 256, `tidy-require`: Keep imports in `require` sorted and grouped by phase, with collections before files.

Applied 12 fixes to [`drracket/drracket/private/tools.rkt`](../blob/HEAD/drracket/drracket/private/tools.rkt)

  * Line 3, `tidy-require`: Keep imports in `require` sorted and grouped by phase, with collections before files.
  * Line 112, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 169, `define-let-to-double-define`: This `let` expression can be pulled up into a `define` expression.
  * Line 192, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 239, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 386, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 434, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 532, `for-each-to-for`: This `for-each` operation can be replaced with a `for` loop.
  * Line 542, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 552, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 577, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 592, `let-to-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.

Applied 1 fix to [`drracket/drracket/private/module-browser.rkt`](../blob/HEAD/drracket/drracket/private/module-browser.rkt)

  * Line 3, `tidy-require`: Keep imports in `require` sorted and grouped by phase, with collections before files.

#### Pass 2

Applied 2 fixes to [`drracket/drracket/private/tools.rkt`](../blob/HEAD/drracket/drracket/private/tools.rkt)

  * Line 131, `cond-let-to-cond-define`: Internal definitions are recommended instead of `let` expressions, to reduce nesting.
  * Line 445, `map-to-for`: This `map` operation can be replaced with a `for/list` loop.

## Summary

Fixed 16 issues in 3 files.

  * Fixed 9 occurrences of `let-to-define`
  * Fixed 3 occurrences of `tidy-require`
  * Fixed 1 occurrence of `define-let-to-double-define`
  * Fixed 1 occurrence of `for-each-to-for`
  * Fixed 1 occurrence of `cond-let-to-cond-define`
  * Fixed 1 occurrence of `map-to-for`

## Follow-up manual fixes

* remove unused bitmap-dc

---------

Co-authored-by: resyntax-ci[bot] <181813515+resyntax-ci[bot]@users.noreply.github.com>
Co-authored-by: Robby Findler <robby@racket-lang.org>

Author: resyntax-ci[bot]

drracket/drracket/private/in-irl-namespace.rkt

@@ -253,7 +253,8 @@
 (define (get-read-language-name/inside) lang-name)
 
 (module+ test
-  (require rackunit racket/gui/base)
+  (require racket/gui/base
+           rackunit)
 
     (define (compute-lang-info/wrap str)
     (define sp (open-input-string str))

drracket/drracket/private/module-browser.rkt

@@ -1,20 +1,20 @@
 #lang racket/base
 
-(require racket/gui/base
-         racket/class
-         racket/set
-         racket/contract
-         syntax/moddep
+(require drracket/private/drsig
+         drracket/private/rectangle-intersect
+         drracket/private/standalone-module-browser
          framework
-         string-constants
          mrlib/graph
-         drracket/private/drsig
-         "eval-helpers-and-pref-init.rkt"
-         racket/unit
          racket/async-channel
+         racket/class
+         racket/contract
+         racket/gui/base
          racket/port
-         drracket/private/rectangle-intersect
-         drracket/private/standalone-module-browser)
+         racket/set
+         racket/unit
+         string-constants
+         syntax/moddep
+         "eval-helpers-and-pref-init.rkt")
 
 (provide module-overview@)