Fix OpenGL flash palettes when not using palette rendering ignoring saturation

chromaticpipe ‎requested to merge
chromaticpipe2/SRB2:fixflashpalsaturation into next

In OpenGL, flash palettes when not using palette rendering ignored saturation due to a missing V_CubeApply call resulting in some weird behavior. This patch fixes it by simply adding V_CubeApply when doing a flash palette in non palette rendering mode.

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