[clangd] Always send file URIs to editors

[kadircet]

Summary

Editors only know about file URIs, make sure we do not use any custom
schemes while sending edits.

clang-tools-extra/clangd/ClangdLSPServer.cpp

auto Action = [this, ApplyEdit, Reply = std::move(Reply),
         return Reply("Tweak applied.");
 
       if (auto Err = validateEdits(DraftMgr, *R))
         return Reply(std::move(Err));
 
       WorkspaceEdit WE;
       WE.changes.emplace();
       for (const auto &It : R->ApplyEdits) {
-        (*WE.changes)[URI::create(It.first()).toString()] =
+        (*WE.changes)[URI::createFile(It.first()).toString()] =
             It.second.asTextEdits();
       }
       // ApplyEdit will take care of calling Reply().
       return ApplyEdit(std::move(WE), "Tweak applied.", std::move(Reply));
     };
     Server->applyTweak(Params.tweakArgs->file.file(),
                        Params.tweakArgs->selection, Params.tweakArgs->tweakID,
                        std::move(Action));