Remove additional entries from CHANGELOG

CHANGELOG

@@ -49,10 +49,7 @@ v 8.9.3
   - Fix missing avatar on system notes. !4954
   - Reduce overhead and optimize ProjectTeam#max_member_access performance. !4973
   - Use update_columns to by_pass all the dirty code on active_record. !4985
-  - Decreased min width of screen to 1280px for pinned sidebar
   - Fix restore Rake task warning message output !4980
-  - Fix encrypted data backwards compatibility after upgrading attr_encrypted gem
-  - Update mobile button icons to be more inline with typical UI paradigms
 v 8.9.2
   - Fix visibility of snippets when searching.