fix tread safty issues by annotating Box Traits correctly

rust/src/main.rs

@@ -31,7 +31,7 @@ use tank::*;
 use crate::config::BoardVersion::INITIAL;
 use crate::hal::{BoardInteraction, PlantHal, HAL, PLANT_COUNT};
 use crate::hal::battery::BatteryInteraction;
-pub static BOARD_ACCESS: Lazy<Arc<Mutex<HAL>>> = Lazy::new(|| Arc::new(PlantHal::create().unwrap()));
+pub static BOARD_ACCESS: Lazy<Mutex<HAL>> = Lazy::new(|| PlantHal::create().unwrap());
 pub static STAY_ALIVE: Lazy<AtomicBool> = Lazy::new(|| AtomicBool::new(false));
 
 mod webserver {