g.gui.gmodeler: typo in model file extension

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@53762 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gmodeler/g.gui.gmodeler.py

@@ -27,7 +27,7 @@
 #%end
 #%option G_OPT_F_INPUT
 #% key: file
-#% description: Name of model file to be loaded (*.gmx)
+#% description: Name of model file to be loaded (*.gxm)
 #% required: no
 #%end