TabBox: Do not highlight selected window for fullscreen switchers

Ismael Asensio requested to merge work/iasensio/tabbox_highlight_fullscreen into master

This helps improving performance on those effects, where the highlighted window is not even shown.

BUG: 449180 FIXED-IN: 5.25.3

Note that the updateHighlightWindows() method seems to be quite heavy for every switcher (at least on my set-up, integrated intel graphics card, where it means a high FPS drop from ~60 FPS to ~30 FPS). Some improvements on this part would also be a general improvement but I haven't profiled it yet.

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