registration: Fix 'arbitrary ResourceLoaderModule definition' schema regex

registration: Fix 'arbitrary ResourceLoaderModule definition' schema regex

We want this regex to match on everything that is not the literal string
'ResourceFileModule' or 'ResourceImageModule' (actually
'ResourceLoaderWikiModule' should be in this too, but I'll fix that in a
follow-up). But the current regex would not match if one of those was in a
substring.

The new regex should match everything that is *not* those two strings.

Bug: T216861
Change-Id: I7d888adfdc67b2075028e49432710308aa0125af