main: reduce duplicate code

Change in memory:
Flash: -36 bytes
SRAM: 0 bytes

src/main.cpp

@@ -95,10 +95,7 @@ static void setup2() {
     mb::buttons.Step();
 
     // Turn off all leds
-    for (uint8_t i = 0; i < config::toolCount; i++) {
-        ml::leds.SetMode(i, ml::green, ml::off);
-        ml::leds.SetMode(i, ml::red, ml::off);
-    }
+    ml::leds.SetAllOff();
     ml::leds.Step();
     mb::buttons.Step();