testscript: remove leading newline before results

Author: bitfield

testscript/testdata/big_diff.txt

@@ -7,7 +7,6 @@ env
 cmpenv stdout stdout.golden
 
 -- stdout.golden --
-
 > cmp a b
 FAIL: $$WORK${/}dir${/}script.txt:1: large files a and b differ
 -- dir/script.txt --

testscript/testdata/long_diff.txt

@@ -110,7 +110,6 @@ cmpenv stdout stdout.golden
 >a
 >a
 -- stdout.golden --
-
 > cmp a b
 --- a
 +++ b

testscript/testscript.go

@@ -426,7 +426,7 @@ func (ts *TestScript) run() {
 
 		markTime()
 		// Flush testScript log to testing.T log.
-		ts.t.Log("\n" + ts.abbrev(ts.log.String()))
+		ts.t.Log(ts.abbrev(ts.log.String()))
 	}()
 	defer func() {
 		ts.deferred()