Fix misc. issues on b&w watches due to GCompOpSet

src/c/main.c

@@ -190,7 +190,9 @@ static void main_window_load(Window *window) {
 	// sleep bar and icon
 	s_sleep_bar_layer = layer_create(s_sleep_bar_start);
 	s_logo_layer = bitmap_layer_create(s_logo_start);
+#if PBL_COLOR
 	bitmap_layer_set_compositing_mode(s_logo_layer, GCompOpSet);
+#endif
 	bitmap_layer_set_bitmap(s_logo_layer, s_logo_icon);
 
 	s_last_watched_layer = text_layer_create(GRect(MARGIN, 0, PBL_DISPLAY_WIDTH - (2 * MARGIN) - NEAT_BAR_WIDTH - PBL_IF_ROUND_ELSE(0, MARGIN / 2), s_available_height)); // y position updated when layer is written to