[clangd] Fix the background index is not disabled when using remote-index.

[kbobyrev]

Oh, thanks!

clang-tools-extra/clangd/tool/ClangdMain.cpp

case PCHStorageFlag::Memory:
     break;
   case PCHStorageFlag::Disk:
     Opts.StorePreamblesInMemory = false;
     break;
   }
   if (!ResourceDir.empty())
     Opts.ResourceDir = ResourceDir;
   Opts.BuildDynamicSymbolIndex = EnableIndex;
-  Opts.BackgroundIndex = EnableBackgroundIndex;
   std::unique_ptr<SymbolIndex> StaticIdx;
   std::future<void> AsyncIndexLoad; // Block exit while loading the index.
   if (EnableIndex && !IndexFile.empty()) {
     // Load the index asynchronously. Meanwhile SwapIndex returns no results.
     SwapIndex *Placeholder;
     StaticIdx.reset(Placeholder = new SwapIndex(std::make_unique<MemIndex>()));
     AsyncIndexLoad = runAsync<void>([Placeholder] {
       if (auto Idx = loadIndex(IndexFile, /*UseDex=*/true))
if (IndexFile.empty()) {
       StaticIdx = remote::getClient(RemoteIndexAddress, ProjectRoot);
       EnableBackgroundIndex = false;
     } else {
       elog("When enabling remote index, IndexFile should not be specified. "
            "Only one can be used at time. Remote index will ignored.");
     }
   }
 #endif
+  Opts.BackgroundIndex = EnableBackgroundIndex;
   Opts.StaticIndex = StaticIdx.get();
   Opts.AsyncThreadsCount = WorkerThreadsCount;
   Opts.BuildRecoveryAST = RecoveryAST;
   Opts.PreserveRecoveryASTType = RecoveryASTType;
   Opts.FoldingRanges = FoldingRanges;
 
   clangd::CodeCompleteOptions CCOpts;
   CCOpts.IncludeIneligibleResults = IncludeIneligibleResults;