Simplify FileDisplayActivity onBackPressed

[alperozturk96]

• Tests written, or not not needed

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/13624.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]

Codacy

Lint

Type	master	PR
Warnings	59	59
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	64	64
Correctness	63	63
Dodgy code	296	296
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	1	1
Multithreaded correctness	6	6
Performance	53	53
Security	18	18
Total	509	509

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 26.55%. Comparing base (cd716b2) to head (b057344).
Report is 59 commits behind head on master.

Files with missing lines	Patch %	Lines
...cloud/android/ui/activity/FileDisplayActivity.java	14.28%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13624      +/-   ##
============================================
+ Coverage     26.44%   26.55%   +0.10%     
- Complexity     3446     3477      +31     
============================================
  Files           674      674              
  Lines         49064    49258     +194     
  Branches       6562     6634      +72     
============================================
+ Hits          12977    13078     +101     
- Misses        34089    34170      +81     
- Partials       1998     2010      +12     

Files with missing lines	Coverage Δ
...cloud/android/ui/activity/FileDisplayActivity.java	28.94% <14.28%> (-0.32%)	⬇️

... and 17 files with indirect coverage changes