fix: Keep applycmdplane boolean on init

Before:
* When performing init(), the boolean were set to False

Now:
* On first init after restart, put it to false
* On latter init, keep the value

DG_PY_FOFBLegacy.py

@@ -218,6 +218,10 @@ class DG_PY_FOFBLegacy(Device):
         Device.init_device(self)
         #----- PROTECTED REGION ID(DG_PY_FOFBLegacy.init_device) ENABLED START -----#
         self.set_state(tango.DevState.INIT)
+
+        # Create and init member _apply_cmds_to_x_plane only if it doesnt exist (first init at startup)
+        # Keeps the value for latter init
+        if not hasattr(self, "_apply_cmds_to_x_plane"):
             self._apply_cmds_to_x_plane = False
             self._apply_cmds_to_z_plane = False