Fix js checker script
The previous script update broke the closure compilation for some apps (like
files.app). This fixes the problem by correcting the values passed into
run_js_check.
The problems can be repro'ed by running:
GYP_GENERATORS=ninja tools/gyp/gyp --depth . ui/file_manager/file_manager/*/js/compiled_resources.gyp && ninja -C out/Default;
After this cl, the above command returns only a single (valid!) error.
BUG=
Review URL: https://codereview.chromium.org/
853983002
Cr-Commit-Position: refs/heads/master@{#311743}