Remove cloning the ImageRPC in the clone method for SdlArtwork

[JulianKast]

Fixes #1818

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

Unit Tests

Github CI unit test

Core Tests

Tested on Manticore for SDL Core v8.1.0 for Android and Generic_HMI v0.12.0 with SDL Core v8.1.0 for JavaSE

Summary

When cloning a SdlArtwork instance, do not clone the imageRPC object with it. This prevents a case where the user changes the file name but the cached object does not update and the T&G manager uses that outdated information.

Changelog

Bug Fixes

• Fix cloning issue as described in SdlArtwork clone issue #1818

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1821 (4f36392) into develop (e5d8537) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 4f36392 differs from pull request most recent head b4b3945. Consider uploading reports for the commit b4b3945 to get more accurate results

@@            Coverage Diff             @@
##             develop    #1821   +/-   ##
==========================================
  Coverage      54.05%   54.06%           
  Complexity      5531     5531           
==========================================
  Files            562      562           
  Lines          25809    25809           
  Branches        3395     3395           
==========================================
+ Hits           13952    13954    +2     
+ Misses         10585    10584    -1     
+ Partials        1272     1271    -1     

Impacted Files	Coverage Δ
...rtdevicelink/streaming/video/SdlRemoteDisplay.java	52.43% <0.00%> (+2.43%)	⬆️