Fix weird message

I noticed this because a translation update gave an error due to a
mismatched final newline.

I was not able to determine a reason to have the trailing newline
or the trailing full stop, so I removed them.

Author: jepler

src/emc/usr_intf/pncconf/pncconf.py

@@ -926,7 +926,7 @@ def load_config(self):
                             raise UserWarning
             except :
                 print(i,j,boardnum)
-                self.warning_dialog(_("It seems data in this file is from too old of a version of PNCConf to continue.\n."),True)
+                self.warning_dialog(_("It seems data in this file is from too old of a version of PNCConf to continue."),True)
                 return True
         else:
             dialog.destroy()