Ensure ace-window window hints consistency

Nicolas De Jaeghere requested to merge Koekelas/modus-themes:ace-window into main

I confess to not know how overlays and the underlying text interact but it appears the face of the overlay is merged with the one of the underlying text. In the case of ace-window window hints, they become italicized if the underlying text is. By setting slant explicitly—what this grandiose patch does—, the occasional odd looking window hint is a thing of the past.

Edited by Nicolas De Jaeghere

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