[Fix v1] t5403: correct bash ambiguous redirect error in subtest 8 by quoting $GIT_DIR

> From: "Randall S. Becker" <rsbecker@nexbridge.com>
>
> The embedded blanks in the full path of the test git repository cased bash
> to generate an ambugious redirect error.
>
> Signed-off-by: Randall S. Becker <rsbecker@nexbridge.com>
> ---

>  t/t5403-post-checkout-hook.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/t/t5403-post-checkout-hook.sh b/t/t5403-post-checkout-hook.sh
> index a539ffc08..a39b3b5c7 100755
> --- a/t/t5403-post-checkout-hook.sh
> +++ b/t/t5403-post-checkout-hook.sh
> @@ -67,7 +67,7 @@ test_expect_success 'post-checkout is triggered on rebase with fast-forward' '
>  test_expect_success 'post-checkout hook is triggered by clone' '
>  	mkdir -p templates/hooks &&
>  	write_script templates/hooks/post-checkout <<-\EOF &&
> -	echo "$@" >$GIT_DIR/post-checkout.args
> +	echo "$@" >"$GIT_DIR/post-checkout.args"
>  	EOF
>  	git clone --template=templates . clone3 &&
>  	test -f clone3/.git/post-checkout.args