fix(@angular-devkit/build-optimizer): remove deprecated wrap enums check

Author: clydin

packages/angular_devkit/build_optimizer/src/index.ts

@@ -16,10 +16,3 @@ export { getPrefixClassesTransformer, testPrefixClasses } from './transforms/pre
 export { getPrefixFunctionsTransformer } from './transforms/prefix-functions';
 export { getScrubFileTransformer, testScrubFile } from './transforms/scrub-file';
 export { getWrapEnumsTransformer } from './transforms/wrap-enums';
-
-/**
- * @deprecated since version 6.0
- */
-export function testWrapEnums(_content: string) {
-  return true;
-}