[dev.go2go] cmd/gofmt: pass UnifiedParamLists to parser

Fixes #41079

Change-Id: I781c5c681c66712ed2ac0112dd44fa8793845978
Reviewed-on: https://go-review.googlesource.com/c/go/+/251278
Run-TryBot: Ian Lance Taylor <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: ianlancetaylor

src/cmd/gofmt/gofmt.go

@@ -61,7 +61,7 @@ func usage() {
 }
 
 func initParserMode() {
-	parserMode = parser.ParseComments
+	parserMode = parser.ParseComments | parser.UnifiedParamLists
 	if *allErrors {
 		parserMode |= parser.AllErrors
 	}