t7005: stop abusing --exec-path

We want the editors in this test on PATH, so put them there.

Signed-off-by: D. Ben Knoble <ben.knoble+github@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7005-editor.sh

@@ -65,7 +65,7 @@ do
 		;;
 	esac
 	test_expect_success "Using $i" '
-		git --exec-path=. commit --amend &&
+		PATH="$PWD:$PATH" git commit --amend &&
 		test_commit_message HEAD expect
 	'
 done
@@ -85,7 +85,7 @@ do
 		;;
 	esac
 	test_expect_success "Using $i (override)" '
-		git --exec-path=. commit --amend &&
+		PATH="$PWD:$PATH" git commit --amend &&
 		test_commit_message HEAD expect
 	'
 done