Revert "Forcing sim808 to powerOff before deep sleep regardless of the current state". Sim808 is used during deepsleep (eg acquiring gps)

This reverts commit ae9a4f318e.

src/MainUnit.cpp

@@ -13,9 +13,7 @@ namespace mainunit {
 	namespace details {
 
 		void prepareSleep() {
-			hardware::sim808::powerOff(); //forcing power off, regardless of the counts and current use
 			hardware::sim808::simSerial.end(); //avoid woke up by SoftwareSerial interrupt
-
 			delay(5); //ensure log messages have been printed out
 		}
 
@@ -47,8 +45,8 @@ namespace mainunit {
 		#define CURRENT_LOGGER_FUNCTION "deepSleep"
 		NOTICE_FORMAT("%ds", seconds);
 
-		details::prepareSleep();
 		interruptIn(seconds);
+		details::prepareSleep();
 		LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
 		details::wokeUp();
 	}