fix: display Bluetooth MAC addresses in conventional MSB-first order

bdAddr bytes are stored LSB-first (HCI wire order) throughout the stack,
but the bluetooth app and btbonds tool formatted them LSB-first too, so
every MAC displayed byte-reversed. Print addr[5] down to addr[0] instead.
Display-only change; wire-order parsing and syscalls untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

programs/src/btbonds/main.cpp

@@ -8,7 +8,7 @@
 
 const char* addr_to_string(char* str, uint8_t* bdAddr) {
     snprintf(str, 18, "%02x:%02x:%02x:%02x:%02x:%02x",
-        bdAddr[0], bdAddr[1], bdAddr[2], bdAddr[3], bdAddr[4], bdAddr[5]
+        bdAddr[5], bdAddr[4], bdAddr[3], bdAddr[2], bdAddr[1], bdAddr[0]
     );
 
     return (const char*)str;