Update git-repl: "nit: Change this to $*"

Both ways seem to work, so I don't oppose the change.

bin/git-repl

@@ -17,7 +17,7 @@ while true; do
 
  # Use arguments as a command if any are provided
  if [ $# -ne 0 ]; then
- cmd="$@"
+ cmd=$*
  set --
  else
  # Readline