Hide the theme selector if there is only 1 theme. #2620

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Run time

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Job	Run time
LuaTest	23s
Linux	5m 47s
Windows (Debug)	5m 33s
MacOS	2m 5s
Windows (RelWithDebInfo)	6m 39s
Windows (Cross-Compile)	3m 44s
Windows (Release)	6m 42s
	30m 53s