Fix #2448 updates tails guide documentation for KeePassX
Fix #2448 updates tails guide documentation for KeePassX

This documentation patch updates the tails guide with the latest
instruction to setup KeePassX.

ehartsuyker/securedrop,conorsch/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,garrettr/securedrop,garrettr/securedrop,micahflee/securedrop,garrettr/securedrop,ehartsuyker/securedrop,conorsch/securedrop,garrettr/securedrop,micahflee/securedrop,conorsch/securedrop,micahflee/securedrop,conorsch/securedrop,heartsucker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,micahflee/securedrop