wxGUI/extension: ignore --help flag

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58819 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/modules/extensions.py

@@ -70,7 +70,7 @@ class InstallExtensionWindow(wx.Frame):
             task = gtask.parse_interface('g.extension.py')
         else:
             task = gtask.parse_interface('g.extension')
-        ignoreFlags = ['l', 'c', 'g', 'a', 'f', 't', 'quiet']
+        ignoreFlags = ['l', 'c', 'g', 'a', 'f', 't', 'help', 'quiet']
         if sys.platform == 'win32':
             ignoreFlags.append('d')
             ignoreFlags.append('i')