wxGUI: fix https://trac.osgeo.org/grass/ticket/1846

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54585 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/core/render.py

@@ -186,10 +186,10 @@ class Layer(object):
             msg = ''
             self.renderMgr.Render(cmd)
         else:
-            ret, msg = RunCommand(self.cmd[0],
+            ret, msg = RunCommand(cmd[0],
                                   getErrorMsg = True,
                                   quiet = True,
-                                  **self.cmd[1])
+                                  **cmd[1])
         
         return ret, msg