Fix CodeGenerationFormat to not leave trailing spaces when adding newlines

Author: roopekv

CodeGeneration/Sources/Utils/CodeGenerationFormat.swift

@@ -151,6 +151,7 @@ public class CodeGenerationFormat: BasicFormat {
     increaseIndentationLevel()
     formattedChildren = formattedChildren.map { child in
       var child = child
+      child.trailingTrivia = Trivia(pieces: child.trailingTrivia.drop(while: \.isSpaceOrTab))
       child.leadingTrivia = indentedNewline + child.leadingTrivia
       return child
     }