Clean up Linux .desktop files #1349

Job	Run time
build_NetCore (Debug_NetCore)	1m 6s
build_NetCore (Debug_NetCore)	1m 6s
build (6.8, Debug)	1m 53s
build (6.8, Debug)	1m 53s
build_NetCore (Release_NetCore)	1m 3s
build_NetCore (Release_NetCore)	1m 3s
build (6.8, Release)	1m 11s
build (6.8, Release)	1m 51s
build (6.10, Debug)	1m 32s
build (6.10, Debug)	1m 32s
build (6.10, Release)	1m 47s
build (6.10, Release)	1m 47s
build (6.12, Debug)	1m 42s
build (6.12, Debug)	1m 42s
build (6.12, Release)	1m 53s
build (6.12, Release)	1m 53s
build (latest, Debug)	1m 15s
build (latest, Debug)	1m 15s
build (latest, Release)	2m 7s
build (latest, Release)	2m 7s
	31m 38s

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