dbus: Reorder deauthentication and cleanup calls when removing a network.

Valgrind indicates reference to already freed memory if function
wpa_config_remove_network() is called prior to calling
wpa_supplicant_deauthenticate(), and this can lead to a crash.
Inverting the call order fixes the problem.

[wpa_supplicant] Reorder calls when removing a network.

Signed-off-by: Hannu Mallat <hannu.mallat@jollamobile.com>