resourceloader: Add test for non-empty user module in scripts-only queue

resourceloader: Add test for non-empty user module in scripts-only queue

The getData() tests did have a test case for a 'user' group module with
isKnownEmpty in the script-only queue, but not yet a non-empty one.

The makeLoad() tests did have both already. Arguably the makeLoad()
tests are higher level and observe its behaviour already (outputting
a script tag means 'loading', outputting nothing means 'ready'),
but adding it to the getData() tests for consistency.

Bug: T188689
Change-Id: I842febf996ba8bb0ea25b5ca3b5ac4503db87376