gcode: M117 fix

Resolves issue where M117 is not correctly executed when the message begins with numeric or special character.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

klippy/gcode.py

@@ -393,6 +393,12 @@ class GCodeParser:
             # Tn command has to be handled specially
             self.cmd_Tn(params)
             return
+        elif cmd.startswith("M117 "):
+            # Handle M117 gcode with numeric and special characters
+            handler = self.gcode_handlers.get("M117", None)
+            if handler is not None:
+                handler(params)
+                return
         self.respond_info('Unknown command:"%s"' % (cmd,))
     def cmd_Tn(self, params):
         # Select Tool