Problem/Motivation
media_library_update_8703() was added in #3039829: Remove link to media item from media library view.. After commit, @catch said that it should have been a post-update hook.
Proposed resolution
Since no hook_update_N's have been added to media_library since that issue, we can convert the update to a post-update. Let's do that. This does not need additional test coverage, as the update is already covered.
Remaining tasks
Do it.
User interface changes
None.
API changes
None.
Data model changes
None.
Release notes snippet
None.