[SourceKit] Indentation: aligning parameters when argument names are present. rdar://24862107

Fix is in AST by removing unnecessary override.
Originally reported by: https://twitter.com/JohnRHeaton/status/702526804138074112

tools/SourceKit/lib/SwiftLang/SwiftEditor.cpp

@@ -1967,7 +1967,7 @@ class FormatWalker: public ide::SourceEntityWalker {
 
         // Function parameters are siblings.
         for (auto P : AFD->getParameterLists()) {
-          for (auto param : *P) {
+          for (ParamDecl* param : *P) {
            if (!param->isSelfParameter())
               addPair(param->getEndLoc(), FindAlignLoc(param->getStartLoc()),
                       tok::comma);