Remove useless network path of the wifi interface when removing network

Remove useless network path of the wifi interface when removing network

When removing a network, if the network path of the interface is not NULL
and has the same information as the network to be removed, it need to be removed.

Otherwise, when a connection to the same network is attempted later,
the connection may not work normally.

Change-Id: Ia1702c05bb19c581b31070fbc7741a846d87a6ee
Signed-off-by: Jaehyun Kim <jeik01.kim@samsung.com>