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 👍