zshrc: fix zstyle ssh-agent forward option

It appears that during rearranging yonks ago we accidentally sourced
oh-my-zsh before we set this setting, leading to the ssh-agent _always_
creating a new agent, even when SSH_AUTH_SOCK had already been set.

This a fairly minor problem, but it does leave to session lingering, and
breaks programs that manage ssh-agent identities, like gnome-keyring, or
systemd user session ssh-agent services.

zshrc

@@ -136,6 +136,7 @@ fi
 if [[ -d ~/.ssh ]]
 then
   zstyle :omz:plugins:ssh-agent lifetime 36h
+  zstyle :omz:plugins:ssh-agent agent-forwarding on
   if [[ -e ~/.ssh/autoload ]] 
   then
       zstyle :omz:plugins:ssh-agent identities $( cat ~/.ssh/autoload )
@@ -144,8 +145,6 @@ fi
 
 [[ -d $ZSH ]] && source $ZSH/oh-my-zsh.sh
 
-zstyle :omz:plugins:ssh-agent agent-forwarding on
-
 # Dynamic Completion
 foreach cmd in kubectl kubeadm
   ( which $cmd &>/dev/null ) && source <($cmd completion zsh)