util: Use proper file collation API

Christopher Davisrequested to merge
wip/cdavis/use-proper-collation-api into main

glib-rs provides an API to get file collation keys that can be used for comparison. This means we do not need to use the function for this ourselves.

This commit gets rid of the manual binding for g_utf8_collate_key_by_filename () in favor of the glib-rs API.

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