[vulkan] Allocate map spaces for dynamic lights

I'm actually surprised anything worked, though I guess it was just the
one entry getting corrupted (and not 32, but I figured allocate slots
for all of the dynamic lights just in case). Or none, really, since
larger scenes (ie, those with multiple lights that fit in the same image
size) would result in not all the maps getting used and thus one spare
for dynamic lights.

libs/video/renderer/vulkan/vulkan_lighting.c

@@ -1671,7 +1671,7 @@ build_shadow_maps (lightingctx_t *lctx, vulkan_ctx_t *ctx)
 	int         totalLayers = 0;
 	int         imageMap[numLights];
 	int         lightMap[numLights];
-	mapdesc_t   maps[numLights];
+	mapdesc_t   maps[numLights + dynlight_max];
 
 	for (int i = 0; i < numLights; i++) {
 		lightMap[i] = i;