desktop: stop renaming desktop file

[soumyaDghosh]

With snapd 2.66, it supports custom desktop file names. This patch allows it to happen from snapcraft side.

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[mr-cal]

Do you know what effect this will have when running a snap on a system with snapd<2.66?

[soumyaDghosh]

Do you know what effect this will have when running a snap on a system with snapd<2.66?

As I tested before, snapd will install the file with a <snap_name>, which snapd will do here also if the desktop file names aren't explicitly mentioned before hand. It was never really an issue to fix with.

[soumyaDghosh]

I think I'll need to fix the spread tests too.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.71%. Comparing base (654871d) to head (99f4e85).
Report is 642 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (654871d) and HEAD (99f4e85). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (654871d)	HEAD (99f4e85)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5150      +/-   ##
==========================================
- Coverage   94.88%   89.71%   -5.17%     
==========================================
  Files         658      342     -316     
  Lines       55189    22641   -32548     
==========================================
- Hits        52364    20312   -32052     
+ Misses       2825     2329     -496     

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