.zshrc: Use simpler GPG agent config

.zshrc

@@ -114,9 +114,11 @@ genpass() {
     </dev/urandom tr -dc 'A-Za-z0-9!"#$%&'\''()*+,-./:;<=>?@[\]^_`{|}~' | head -c 15 ; echo
 }
 
-# Activate GPG agent and cache the password after first use
-# See: https://github.com/axtl/gpg-agent.zsh
-source ~/src/git/dotfiles/gpg-agent.plugin.zsh
+# set GPG TTY
+export GPG_TTY=$(tty)
+#
+# Refresh gpg-agent tty in case user switches into an X Session
+gpg-connect-agent updatestartuptty /bye >/dev/null
 
 export PATH
 export MANPATH