Fix a metadata test to not have whitespace before the "(". (#1154)

With records coming, we use whitespace there to disambiguate metadata
annotation arguments from a subsequent record type annotation. There
was a metadata formatting test whose before code had whitespace there
and now will be interpreted differently (and erroneously) by the
language. This fixes that test.

Author: munificent

CHANGELOG.md

@@ -4,6 +4,10 @@
 * Format unnamed libraries.
 * Require Dart 2.18.
 * Use typed `_visitFunctionOrMethodDeclaration` instead of dynamically typed.
+* Fix metadata test to not fail when record syntax makes whitespace between
+  metadata annotation names and `(` significant ([sdk#50769][]).
+
+[sdk#50769]: https://github.com/dart-lang/sdk/issues/50769
 
 # 2.2.4
 

test/whitespace/metadata.unit

@@ -280,7 +280,7 @@ class A {
 @foo
 typedef Fn = Function();
 >>> metadata on non-function typedef
-@foo typedef Hash< @a  K, @b  (  1  )  V  >  =  Map < K ,  V >   ;
+@foo typedef Hash< @a  K, @b(  1  )  V  >  =  Map < K ,  V >   ;
 <<<
 @foo
 typedef Hash<@a K, @b(1) V> = Map<K, V>;