Handle booting up directly into sleep

Previously when SLEEP# is LOW while booting up the matrix, the startup
animation would turn on the LEDs even though we're in sleep.
And because we don't do anything while sleeping, the loop won't turn the
LEDs off anymore.

Now the matrix will stay off, if booting into sleep.

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

ledmatrix/src/main.rs

@@ -262,7 +262,8 @@ fn main() -> ! {
         }
 
         // Handle period display updates. Don't do it too often
-        if timer.get_counter().ticks() > prev_timer + state.animation_period {
+        let render_again = timer.get_counter().ticks() > prev_timer + state.animation_period;
+        if matches!(state.sleeping, SleepState::Awake) && render_again {
             // On startup slowly turn the screen on - it's a pretty effect :)
             match startup_percentage {
                 Some(p) if p <= 100 => {