editor: don't use 'wep40 'wep104' values for pairwise (rh #1005171)

The values were removed from the allowed 'pairwise' property values by
5f61594585b22cdb72ee5279de5a8d9e86b125cf commit.

Anyway, both 'pairwise' and 'group' property (ciphers) are only valid for WPA.