[vulkan] Correct OIT sorting

The reversed depth buffer is very nice, but it also reversed the OIT
blending. Too much demo watching not enough walking around in the maps
(especially start near the episode 4 gate).

libs/video/renderer/vulkan/shader/oit_blend.finc

@@ -19,7 +19,7 @@ BlendFrags (vec4 color)
 	for (int i = 1; i < numFrags; i++) {
 		FragData    toInsert = frags[i];
 		int         j = i;
-		while (j > 0 && toInsert.depth > frags[j - 1].depth) {
+		while (j > 0 && toInsert.depth < frags[j - 1].depth) {
 			frags[j] = frags[j - 1];
 			j--;
 		}