wxGUI: don't failed when loading map layers in quiet mode (from workspace)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@65211 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/core/render.py

@@ -189,9 +189,9 @@ class Layer(object):
             msg = ''
             self.renderMgr.Render(cmd, env=self.environ)
         else:
+            cmd[1]['quiet'] = True
             ret, msg = RunCommand(cmd[0],
                                   getErrorMsg = True,
-                                  quiet = True,
                                   env=self.environ,
                                   **cmd[1])