Bugfix/issue 1276

[JulianKast]

Fixes #1276

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).
• I have tested Android, Java SE, and Java EE

Summary

Fixed unit test for FileManagerTest

Bug Fixes

• Fixed unit test for FileManagerTest

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1287 into develop will increase coverage by 0.03%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #1287      +/-   ##
=============================================
+ Coverage      47.41%   47.45%   +0.03%     
- Complexity      4371     4375       +4     
=============================================
  Files            483      483              
  Lines          23677    23677              
  Branches        2733     2733              
=============================================
+ Hits           11227    11235       +8     
+ Misses         11762    11755       -7     
+ Partials         688      687       -1     

Impacted Files	Coverage Δ	Complexity Δ
...tdevicelink/managers/audio/AudioDecoderCompat.java	73.33% <0.00%> (+3.33%)	3.00% <0.00%> (ø%)	⬆️
...smartdevicelink/managers/file/BaseFileManager.java	66.47% <0.00%> (+3.52%)	27.00% <0.00%> (+4.00%)	⬇️