Media: Tiny logic fix in `wp_image_file_matches_image_meta()` after [48329]....

Media: Tiny logic fix in `wp_image_file_matches_image_meta()` after [48329]. No need to look in `sizes` if the full size image path/URL matches.

See #50543.
Built from https://develop.svn.wordpress.org/trunk@48430


git-svn-id: https://core.svn.wordpress.org/trunk@48199 1a063a9b-81f0-0310-95a4-ce76da25c4cd