[aur-general] Remove request:airdrop-ng, airgraph-ng and aircrack-ptw

airdrop-ng and airgraph-ng is duplicated with aircrack-ng-scripts in community. aircrack-ptw has been included into aircrack-ng since version 0.9, and the source link in PKGBUILD has down. airdrop-ng:https://aur.archlinux.org/packages.php?ID=41584 airgraph-ng:https://aur.archlinux.org/packages.php?ID=44546 aircrack-ptw:https://aur.archlinux.org/packages.php?ID=18331