gst_caps_to_string() is not always only MIME type
gst_caps_to_string() is not always only MIME type

In the case of audio/x-mod, other information may follow, so use
g_str_has_prefix() instead of strcmp().

wmvanvliet/Chimara,wmvanvliet/Chimara,wmvanvliet/Chimara,wmvanvliet/Chimara,wmvanvliet/Chimara