Fix bug in IC::invalidate() (#2166)
Fix bug in IC::invalidate() (#2166)

When we recently made invalidate(file) have a 'force' parameter, we
botched it by not so forcing a particular call in invalidate_all().
In the line being changed here, we're dealing with a list of files
that definitely need invalidation due to special tests, so once
we've established that, we want to force it.

Pointed out by @ThiagoIze in a post-merge comment in #2133
OpenImageIO/oiio,lgritz/oiio,OpenImageIO/oiio,lgritz/oiio,OpenImageIO/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio