BLTouch.init should not deploy (#13988)

Low or unknown probe clearance on init (even at powerup) is a risk and therefore, a deploy should be avoided because dragging the pin is possible: A deploy goes into alarm if it can't extend fully and then the subsequent stow will fail.

Marlin/src/feature/bltouch.cpp

   #if ENABLED(BLTOUCH_FORCE_5V_MODE)
     _set_5V_mode();                          // Set 5V mode if explicitely demanded (V3 upwards)
   #endif
-  clear();
+  _reset();
+  _stow();
   // There really should be no alarm outstanding now, and no triggered condition. But if there is,
   // there is no need to worry people here on init right at the start of the printer.
 }