[clangd] Fix gcc warning about extra ";" [NFC]

gcc complained with

/data/repo/master/clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp:326:30: warning: extra ';' [-Wpedantic]
 REGISTER_TWEAK(DefineOutline);
                              ^

Author: mikaelholmen

clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp

@@ -323,7 +323,7 @@ class DefineOutline : public Tweak {
   const FunctionDecl *Source = nullptr;
 };
 
-REGISTER_TWEAK(DefineOutline);
+REGISTER_TWEAK(DefineOutline)
 
 } // namespace
 } // namespace clangd