Revert accidental commit.

...enabling Chris's nifty fix-it updater tool. Now that I've done
it too, maybe I'll put in a frontend flag for it after all.

Author: jrose-apple

lib/Frontend/DiagnosticVerifier.cpp

@@ -697,7 +697,7 @@ bool swift::verifyDiagnostics(SourceManager &SM, ArrayRef<unsigned> BufferIDs) {
   auto *Verifier = (DiagnosticVerifier*)SM.getLLVMSourceMgr().getDiagContext();
   SM.getLLVMSourceMgr().setDiagHandler(nullptr, nullptr);
 
-  bool autoApplyFixes = true;
+  bool autoApplyFixes = false;
 
   bool HadError = false;