Gmoccapy - addition of note in LOG

Every time I read the LOG, I wonder what the number behind MDI mode is. So I added it.

Author: zz912

src/emc/usr_intf/gmoccapy/gmoccapy.py

@@ -2742,7 +2742,7 @@ def on_hal_status_mode_manual(self, widget):
         self.last_key_event = None, 0
 
     def on_hal_status_mode_mdi(self, widget):
-        LOG.debug("MDI Mode {0}".format(self.tool_change))
+        LOG.debug("MDI Mode, tool_change = {0}".format(self.tool_change))
 
         # if the edit offsets button is active, we do not want to change
         # pages, as the user may want to edit several axis values