properly reload favorites list

[icewind1991]

To test:

• add a favorite
• go to "Favorites"
• go to "All Files"
• go back to "Favorites"

see also #4293

[mention-bot]

@icewind1991, thanks for your PR! By analyzing the history of the files in this pull request, we identified @vgezer to be a potential reviewer.

[codecov]

Codecov Report

Merging #4423 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4423      +/-   ##
============================================
+ Coverage     54.18%   54.18%   +<.01%     
  Complexity    21635    21635              
============================================
  Files          1327     1327              
  Lines         82778    82778              
  Branches       1312     1312              
============================================
+ Hits          44854    44855       +1     
+ Misses        37924    37923       -1

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Security/CertificateManager.php	92.78% <0%> (-1.04%)	38% <0%> (ø)
apps/files_trashbin/lib/Trashbin.php	73.39% <0%> (-0.25%)	133% <0%> (ø)
lib/private/Server.php	93.35% <0%> (+0.14%)	120% <0%> (ø)	⬇️
apps/comments/lib/EventHandler.php	87.5% <0%> (+8.33%)	7% <0%> (ø)	⬇️

[MorrisJobke]

Tested and works 👍