[LPM] - Fix reboot loop when low power is used (#1444)

By not deinitializing BLE at the start, if it has not been initialized. Setting the time between waking up from the macro rather than the config interval.
This one does not have a value at the start.

main/ZgatewayBT.ino

@@ -760,8 +760,8 @@ void coreTask(void* pvParameters) {
 }
 
 void lowPowerESP32() { // low power mode
-  Log.trace(F("Going to deep sleep for: %l s" CR), (BTConfig.BLEinterval / 1000));
-  deepSleep(BTConfig.BLEinterval * 1000);
+  Log.trace(F("Going to deep sleep for: %l s" CR), (TimeBtwRead / 1000));
+  deepSleep(TimeBtwRead * 1000);
 }
 
 void deepSleep(uint64_t time_in_us) {
@@ -771,7 +771,7 @@ void deepSleep(uint64_t time_in_us) {
 #  endif
 
   Log.trace(F("Deactivating ESP32 components" CR));
-  BLEDevice::deinit(true);
+  if (BLEDevice::getInitialized()) BLEDevice::deinit(true);
   esp_bt_mem_release(ESP_BT_MODE_BTDM);
   // Ignore the deprecated warning, this call is necessary here.
 #  pragma GCC diagnostic push