We need to fix them properly as part of #198.

This commit fixes the `testWithQueryFrontend` test, which was broken by

6bc41d73

However, this was followed by a frontend fix, which was modified to deal
with the next format:

purescript-gargantext!374 (diffs)

Therefore, it's fine to fix the test here.

This commit removes the 'cache:key:files' directive because our CI's
gitlab is currently too old to support it.