Reword changelog on favicons

CHANGELOG.rst

@@ -23,7 +23,7 @@ Added
 Fixed
 ~~~~~
 
-* Existing FaviconImg objects were not updated when a new Favicon image is uploaded via preferences
+* Changing the favicon did not result in all icons being replaced in some cases
 * GroupManager.get_queryset() returned an incomplete QuerySet
 * OAuth was broken by a non-semver-adhering django-oauth-toolkit update
 * Too long texts in chips didn't result in a larger chip.