Revert "forgot to change the CodeAction kind in the test suite..."

This reverts commit 6e88299.

Author: drsooch

plugins/hls-change-type-signature-plugin/test/Main.hs

@@ -112,8 +112,8 @@ findChangeTypeActions = pure . filter isChangeTypeAction . rights . map toEither
         isChangeTypeAction CodeAction{_kind} = case _kind of
           Nothing -> False
           Just kind -> case kind of
-            "quickfix.changeTypeSignature" -> True
-            _                              -> False
+            "quickfix.changeSignature" -> True
+            _                          -> False
 
 
 regexTest :: FilePath -> Text -> Bool -> TestTree