Request 8-bit per R/G/B plane in video display

Fix color banding and inaccurate colors being displayed on some systems,
especially Wayland, arising from the video display choosing a pixel
format with too low of a bit depth.

Author: arch1t3cht

src/video_display.cpp

@@ -72,7 +72,7 @@ namespace {
 /// Attribute list for gl canvases; set the canvases to doublebuffered rgba with an 8 bit stencil buffer
 wxGLAttributes buildGLAttributes() {
 	wxGLAttributes attrs;
-	attrs.RGBA().DoubleBuffer().Stencil(8).EndList();
+	attrs.RGBA().MinRGBA(8, 8, 8, 0).DoubleBuffer().Stencil(8).EndList();
 	return attrs;
 }