Fix the file-status missing issue.

Fixes #362.

The `await` was introduced by an unintended change in the languageclient-v8 patch.

FileStatus listens the client state-changing event, which should not wait until the client has
been started (otherwise, we will miss some state-change events).

Author: hokein

src/clangd-context.ts

@@ -163,7 +163,7 @@ export class ClangdContext implements vscode.Disposable {
     memoryUsage.activate(this);
     ast.activate(this);
     openConfig.activate(this);
-    await this.client.start();
+    this.client.start();
     console.log('Clang Language Server is now active!');
     fileStatus.activate(this);
     switchSourceHeader.activate(this);