Force removal of wpad-basic in flavours

After making qmp-system depend on wpad-mesh, wpad-basic has been added
to the default packages for non-small-flash devices, so it must be
explicitly not added to the images to avoid file collisions between
the two packages.
Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>

qmp.flavors.conf

 # Flavors
 openwrt_vanilla="luci"
-qmp_cli="qmp-system -opkg -kmod-usb-core -kmod-usb-ledtrig-usbport -kmod-usb2 -ppp -ppp-mod-pppoe -6relayd -odhcp6c -odhcpd -ip6tables -firewall -wpad-mini"
-qmp_tiny="qmp-tiny-node -opkg -kmod-usb-core -kmod-usb-ledtrig-usbport -kmod-usb2 -ppp -ppp-mod-pppoe -6relayd -odhcp6c -odhcpd -ip6tables -firewall -wpad-mini"
-qmp_small="qmp-small-node opkg qmp-ncd -wpad-mini"
-qmp_big="qmp-big-node opkg qmp-ncd qmp-ncgui -wpad-mini"
+qmp_cli="qmp-system -opkg -kmod-usb-core -kmod-usb-ledtrig-usbport -kmod-usb2 -ppp -ppp-mod-pppoe -6relayd -odhcp6c -odhcpd -ip6tables -firewall -wpad-mini -wpad-basic"
+qmp_tiny="qmp-tiny-node -opkg -kmod-usb-core -kmod-usb-ledtrig-usbport -kmod-usb2 -ppp -ppp-mod-pppoe -6relayd -odhcp6c -odhcpd -ip6tables -firewall -wpad-mini -wpad-basic"
+qmp_small="qmp-small-node opkg qmp-ncd -wpad-mini -wpad-basic"
+qmp_big="qmp-big-node opkg qmp-ncd qmp-ncgui -wpad-mini -wpad-basic"