only add -l when default_shell is bash

Author: tessus

scripts/restore.sh

@@ -100,7 +100,11 @@ tmux_socket() {
 # tmux server each time.
 cache_tmux_default_command() {
 	local default_shell="$(get_tmux_option "default-shell" "")"
-	export TMUX_DEFAULT_COMMAND="$(get_tmux_option "default-command" "-l $default_shell")"
+	local opt=""
+	if [ "$(basename "$default_shell")" == "bash" ]; then
+		opt="-l "
+	fi
+	export TMUX_DEFAULT_COMMAND="$(get_tmux_option "default-command" "$opt$default_shell")"
 }
 
 tmux_default_command() {