Remove duplicate identifier

This was also caught while running gulp-typescript.

Author: elenatanasoiu

extensions/ql-vscode/src/vscode-tests/no-workspace/interface-utils.test.ts

@@ -5,7 +5,6 @@ import {
   Position,
   window,
   ViewColumn,
-  Uri,
   WebviewPanel,
 } from "vscode";
 import { basename } from "path";