t7500: fix GIT_EDITOR shell snippet

2140b14 (commit: error out for missing commit message template,
2011-02-25) defined

    GIT_EDITOR="echo hello >\"\$1\""

for these two tests, with the intention that 'hello' would be
written in the given file, but as Phillip Wood points out,
GIT_EDITOR is invoked by shell after getting expanded to

    sh -c 'echo hello >"$1" "$@"' 'echo hello >"$1"' path/to/file

which is not what we want.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: gitster

t/t7500-commit-template-squash-signoff.sh

@@ -31,7 +31,7 @@ test_expect_success 'nonexistent template file should return error' '
 	echo changes >> foo &&
 	git add foo &&
 	(
-		GIT_EDITOR="echo hello >\"\$1\"" &&
+		GIT_EDITOR="echo hello >" &&
 		export GIT_EDITOR &&
 		test_must_fail git commit --template "$PWD"/notexist
 	)
@@ -40,7 +40,7 @@ test_expect_success 'nonexistent template file should return error' '
 test_expect_success 'nonexistent template file in config should return error' '
 	test_config commit.template "$PWD"/notexist &&
 	(
-		GIT_EDITOR="echo hello >\"\$1\"" &&
+		GIT_EDITOR="echo hello >" &&
 		export GIT_EDITOR &&
 		test_must_fail git commit --allow-empty
 	)