fix(lora): skip DIO detach when no ISR is attached (#11386)

* fix(lora): skip DIO detach when no ISR is attached

Fixes #11371

* fix(lora): latch the ISR-armed flag instead of tracking attach state

The flag is now written once from task context and only read from ISR context.

src/mesh/LR11x0Interface.cpp

@@ -318,7 +318,7 @@ template <typename T> bool LR11x0Interface<T>::reconfigure()
     return true;
 }
 
-template <typename T> void LR11x0Interface<T>::disableInterrupt()
+template <typename T> void LR11x0Interface<T>::clearRadioIsr()
 {
     lora.clearIrqAction();
 }