Using names that match real OOjs UI icons is confusing when trying to
find usages of the real icons and when debugging the tests.
Bug: T166730
Change-Id: Ibb97c0347476efc95f1a50c97822d7dab19737f2
Also remove some wrappers from ResourceLoaderImageModule tests that
are no longer necessary, since the files they were mocking now exist.
Bug: T86334
Change-Id: If02e58716ce8e6c8327c8939c6c6425bd48bb560