mark ssh shell-integration wrapper as a function this matches other features + fixes a case where users alias to some other command

src/shell-integration/bash/ghostty.bash

@@ -103,7 +103,7 @@ fi
 
 # SSH Integration
 if [[ "$GHOSTTY_SHELL_FEATURES" == *ssh-* ]]; then
-  ssh() {
+  function ssh() {
     builtin local ssh_term ssh_opts
     ssh_term="xterm-256color"
     ssh_opts=()