build: make internal-angular karma reporter compatible with latest karma (#24803)

Due to changes in karma@1.0.0, `internal-angular` karma reporter stopped
showing browser logs (such as `console.log()` etc.).
Related to d571a5173.

PR Close #24803

tools/tsc-watch/tsc_watch.ts

@@ -10,7 +10,6 @@
 import {spawn} from 'child_process';
 import {platform} from 'os';
 import {normalize} from 'path';
-import {resolve} from 'url';
 
 enum State {
   idle,