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/SX126xInterface.h

@@ -47,12 +47,12 @@ template <class T> class SX126xInterface : public RadioLibInterface
     /**
      * Glue functions called from ISR land
      */
-    virtual void disableInterrupt() override;
+    virtual void clearRadioIsr() override;
 
     /**
      * Enable a particular ISR callback glue function
      */
-    virtual void enableInterrupt(void (*callback)()) override;
+    virtual void setRadioIsr(void (*callback)()) override;
 
 #ifdef LORA_DIO1_SOFTWARE_POLL
     void handleSoftwareLoraIrqPoll() override;