Simplify trailing trivia trimming expression in AttributeRemover

Author: gohanlon

Sources/SwiftSyntaxMacroExpansion/MacroSystem.swift

@@ -438,17 +438,8 @@ private class AttributeRemover: SyntaxRewriter {
     {
       if !triviaToAttachToNextToken.isEmpty {
         triviaToAttachToNextToken = triviaToAttachToNextToken.trimmingSuffix(while: \.isSpaceOrTab)
-      } else {
-        if let last = filteredAttributes.last {
-          filteredAttributes =
-            filteredAttributes.dropLast()
-            + [
-              last.with(
-                \.trailingTrivia,
-                last.trailingTrivia.trimmingSuffix(while: \.isSpaceOrTab)
-              )
-            ]
-        }
+      } else if let lastAttribute = filteredAttributes.last {
+        filteredAttributes[filteredAttributes.count - 1].trailingTrivia = lastAttribute.trailingTrivia.trimmingSuffix(while: \.isSpaceOrTab)
       }
     }
     return AttributeListSyntax(filteredAttributes)