[stable-3.10] spinner: if primary color is white, use grey

[backportbot-nextcloud]

backport of #5120

[nextcloud-android-bot]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/12178.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[nextcloud-android-bot]

Lint

Type	stable-3.10	PR
Warnings	74	74
Errors	0	0

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	26
Correctness Warnings	71
Internationalization Warnings	13
Malicious code vulnerability Warnings	5
Multithreaded correctness Warnings	9
Performance Warnings	107
Security Warnings	44
Dodgy code Warnings	139
Total	414

SpotBugs (stable-3.10)

Warning Type	Number
Bad practice Warnings	26
Correctness Warnings	71
Internationalization Warnings	13
Malicious code vulnerability Warnings	5
Multithreaded correctness Warnings	9
Performance Warnings	107
Security Warnings	44
Dodgy code Warnings	139
Total	414

[codecov]

Codecov Report

Merging #5125 into stable-3.10 will decrease coverage by 0.05%.
The diff coverage is 100%.

@@                Coverage Diff                @@
##             stable-3.10    #5125      +/-   ##
=================================================
- Coverage          17.74%   17.68%   -0.06%     
  Complexity             3        3              
=================================================
  Files                392      392              
  Lines              33116    33116              
  Branches            4651     4651              
=================================================
- Hits                5875     5858      -17     
- Misses             26288    26299      +11     
- Partials             953      959       +6

Impacted Files	Coverage Δ	Complexity Δ
...loud/android/ui/fragment/ExtendedListFragment.java	52.45% <100%> (ø)	0 <0> (ø)	⬇️
...d/android/operations/GetCapabilitiesOperation.java	75% <0%> (-12.5%)	0% <0%> (ø)
...com/nextcloud/client/logger/LegacyLoggerAdapter.kt	66.66% <0%> (-11.12%)	0% <0%> (ø)
...in/java/com/owncloud/android/datamodel/OCFile.java	64.6% <0%> (-3.1%)	0% <0%> (ø)
...ain/java/com/nextcloud/client/logger/LoggerImpl.kt	86.95% <0%> (-2.9%)	0% <0%> (ø)
...owncloud/android/ui/adapter/OCFileListAdapter.java	28.28% <0%> (-0.91%)	0% <0%> (ø)
...oud/android/ui/activity/SyncedFoldersActivity.java	26.31% <0%> (-0.51%)	0% <0%> (ø)
...cloud/android/ui/activity/FileDisplayActivity.java	20.12% <0%> (-0.24%)	0% <0%> (ø)
...loud/android/datamodel/ThumbnailsCacheManager.java	32.84% <0%> (ø)	0% <0%> (ø)	⬇️
.../third_parties/daveKoeller/AlphanumComparator.java	82.14% <0%> (+1.19%)	0% <0%> (ø)	⬇️
... and 2 more