[stable11] Use correct theming when returning the defaults

[nickvergessen]

Backport #3163

[codecov-io]

Codecov Report

Merging #3399 into stable11 will increase coverage by <.01%.

@@              Coverage Diff               @@
##             stable11    #3399      +/-   ##
==============================================
+ Coverage       57.13%   57.14%   +<.01%     
  Complexity      19418    19418              
==============================================
  Files            1206     1206              
  Lines           72718    72719       +1     
  Branches         1235     1235              
==============================================
+ Hits            41550    41552       +2     
+ Misses          31168    31167       -1

Impacted Files	Coverage Δ	Complexity Δ
core/Application.php	0% <ø> (ø)	2 <1> (ø)	❌
lib/private/Server.php	92.72% <ø> (+0.16%)	119% <ø> (ø)	❌
lib/private/Files/Storage/DAV.php	7.32% <ø> (+0.23%)	159% <ø> (ø)	❌

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[MorrisJobke]

Tested and works 👍