This reverts commit 091b31930a107ddbbb73be29ccdf8649235e2e62.
Context: https://linear.app/comm/issue/ENG-1481/revisit-medialibrary-sortby
Additional context: https://linear.app/comm/issue/ENG-2111/max-sees-old-images-ahead-of-recent-ones-in-image-gallery
Basically @max and I and others have noticed that the sort order of our images in the `MediaGalleryKeyboard` is incorrect. This appears to be the case both on Android and iOS (see Linear issues for further discussion).
The changes in D4836 were to address an issue where certain media were being "pushed to the front" when viewed/edited because we were sorting by `modificationTime`.
However, after those changes landed I noticed that the order of media in `MediaGalleryKeyboard`was not as I expected on iOS.
After pushing build 159 to prod on Android, I got feedback that the sort order appeared to be alphabetically going through folder names... which was also unexpected behavior.
This diff reverts the sort order to what it was in build 131 (last public App Store release)