reset countdown at the end of the reset from side

(cherry picked from commit c84888c)

Author: UrszulaNeuman

dls_barcode/gui/countdown_box.py

@@ -45,6 +45,6 @@ def reset_countdown(self):
 
     def display(self):
         self._message_lbl.clear()
-        if self.count is not None and self.count >= 0:
+        if self.count is not None and self.count > 0:
             self._message_lbl.setText(str(self.count))
             self.count = self.count - 1

dls_barcode/main_manager.py

@@ -68,8 +68,8 @@ def _restart_live_capture_from_top(self):
 
     def _restart_live_capture_from_side(self):
         self._reset_msg_timer()
-        self._ui.resetCountdown()
         self._camera_switch.restart_live_capture_from_side()
+        self._ui.resetCountdown()
 
     def _read_message_queue(self):
         if self._message_queue.empty():