BackupFragment: request write_calendar permission for backup

[AlvaroBrey]

Needed to ensure events have UIDs for ICS export

Fixes #9527

• [x] Tests written, or not not needed

[AlvaroBrey]

/backport to stable-3.21

[github-actions[bot]]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/10609.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.

[github-actions[bot]]

Codacy

Lint

Type	master	PR
Warnings	85	85
Errors	0	0

SpotBugs

Category	Base	New
Bad practice	29	29
Correctness	46	46
Dodgy code	353	353
Experimental	1	1
Internationalization	9	9
Multithreaded correctness	9	9
Performance	58	58
Security	28	28
Total	533	533

[codecov[bot]]

Codecov Report

Merging #10609 (2d39820) into master (c1bda69) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #10609      +/-   ##
============================================
- Coverage     31.73%   31.71%   -0.02%     
  Complexity     3321     3321              
============================================
  Files           540      540              
  Lines         40217    40221       +4     
  Branches       5560     5561       +1     
============================================
- Hits          12761    12755       -6     
- Misses        25546    25558      +12     
+ Partials       1910     1908       -2     

Impacted Files	Coverage Δ
...oid/ui/fragment/contactsbackup/BackupFragment.java	0.00% <0.00%> (ø)
...third_parties/sufficientlysecure/SaveCalendar.java	0.00% <ø> (ø)
...d/android/operations/UpdateOCVersionOperation.java	64.28% <0.00%> (-7.15%)	:arrow_down:
...ncloud/android/ui/activity/FolderPickerActivity.kt	27.24% <0.00%> (-4.31%)	:arrow_down:
...d/android/operations/SynchronizeFileOperation.java	37.23% <0.00%> (-1.07%)	:arrow_down:
...cloud/android/ui/activity/SyncedFoldersActivity.kt	19.50% <0.00%> (-0.69%)	:arrow_down:
...xtcloud/client/account/UserAccountManagerImpl.java	71.62% <0.00%> (-0.68%)	:arrow_down:
...loud/android/datamodel/FileDataStorageManager.java	60.98% <0.00%> (-0.49%)	:arrow_down:
.../java/com/nextcloud/client/jobs/OfflineSyncWork.kt	60.93% <0.00%> (ø)
...cloud/android/ui/activity/FileDisplayActivity.java	27.75% <0.00%> (+0.49%)	:arrow_up:
... and 4 more