Delete common-test-setup-karma.ts

All it's workarounds have been unnecessary and removed.

Release-Notes: skip
Change-Id: I39cb711151555f735a5014f36941ebd886c21a2d
diff --git a/polygerrit-ui/app/utils/syntax-util_test.ts b/polygerrit-ui/app/utils/syntax-util_test.ts
index ffd9d5c..4bf5823 100644
--- a/polygerrit-ui/app/utils/syntax-util_test.ts
+++ b/polygerrit-ui/app/utils/syntax-util_test.ts
@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 import {assert} from '@open-wc/testing';
-import '../test/common-test-setup-karma';
+import '../test/common-test-setup';
 import './syntax-util';
 import {
   highlightedStringToRanges,