resourceloader: Remove unused string[] module logic in register()

resourceloader: Remove unused string[] module logic in register()

There are two signatures for this method that we test, document,
and use:

1. register( name, version, ... )

2. register( [ [name,version,...], [name,version,..], ... ] )

But the code was also allowing a third kind that is never used,
and also not documented anywhere or tested.

3. register( [ name, name, ... ] )

Change-Id: I3ed69117affd83d03c4c629d352f19bad50395c9