Jumping to messages from search results is broken

This seems to be some regression. Not sure when it first broke, but it was pre-Element.

I'm currently running element-ios 1.0.1.

Searching for messages in a (non-E2EE) room yields some results, as expected. However, tapping on them leads to an empty screen. Seems like back-pagination is broken or something.

Reproduce the issue by searching messages in a non-E2EE room on element-ios 1.0.1 and tapping a result. Trace the search-result navigation and back-pagination path; done means tapping a result opens the matching message instead of an empty screen.

Written by the indexing model from the issue text.