Allow redacted events as latest event

[jplatte]

Maybe a fix for element-hq/element-x-ios#1441, I'm really not sure 😅

We've always wanted to include redacted events AFAICT, it was likely just a misunderstanding that we might want to exclude them.

[codecov]

Codecov Report

Patch coverage: 92.85% and project coverage change: -0.02% ⚠️

Comparison is base (cc469f6) 77.45% compared to head (eeeaea9) 77.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2512      +/-   ##
==========================================
- Coverage   77.45%   77.43%   -0.02%     
==========================================
  Files         178      178              
  Lines       19208    19210       +2     
==========================================
- Hits        14878    14876       -2     
- Misses       4330     4334       +4     

Files Changed	Coverage Δ
...s/matrix-sdk-ui/src/timeline/event_item/content.rs	54.80% <91.66%> (+0.68%)	⬆️
crates/matrix-sdk-base/src/latest_event.rs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[andybalaam]

Looks great, and fwiw I disagree with SonarCloud that this reduces coverage ;-)