Set WLC_IDLE_TIME to 0

sway/main.c

@@ -22,6 +22,7 @@ int main(int argc, char **argv) {
 		sway_log(L_ERROR, "Config load failed, aborting sway post init!");
 	}
 
+	setenv("WLC_IDLE_TIME", "0", 0);
 	setenv("WLC_DIM", "0", 0);
 	if (!wlc_init(&interface, argc, argv)) {
 		return 1;