stepconf: temporarily disable "sanity test"

this code is intended to change the text to red when invalid
(less than or equal to zero?) values are entered.  However, on
my system it had the effect of changing the widgets in question to
white-on-white in all my axis tabs.

Signed-off-by: Jeff Epler <jepler@unpythonic.net>

src/emc/usr_intf/stepconf/stepconf.py

@@ -1025,6 +1025,7 @@ class StepconfApp:
             self.w[axis + "axistest"].set_sensitive(0)
 
     def axis_sanity_test(self, axis):
+        return
         # I hate the inner function
         def get(n):
             return float(self.w[axis + n].get_text())