tag: fix --sort tests to use cat<<-\EOF format

The --sort tests should use the better format for >expect to maintain
indenting and ensure that no substitution is occurring. This makes
parsing and understanding the tests a bit easier.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7004-tag.sh

@@ -1385,41 +1385,41 @@ test_expect_success 'lexical sort' '
 	git tag foo1.6 &&
 	git tag foo1.10 &&
 	git tag -l --sort=refname "foo*" >actual &&
-	cat >expect <<EOF &&
-foo1.10
-foo1.3
-foo1.6
-EOF
+	cat >expect <<-\EOF &&
+	foo1.10
+	foo1.3
+	foo1.6
+	EOF
 	test_cmp expect actual
 '
 
 test_expect_success 'version sort' '
 	git tag -l --sort=version:refname "foo*" >actual &&
-	cat >expect <<EOF &&
-foo1.3
-foo1.6
-foo1.10
-EOF
+	cat >expect <<-\EOF &&
+	foo1.3
+	foo1.6
+	foo1.10
+	EOF
 	test_cmp expect actual
 '
 
 test_expect_success 'reverse version sort' '
 	git tag -l --sort=-version:refname "foo*" >actual &&
-	cat >expect <<EOF &&
-foo1.10
-foo1.6
-foo1.3
-EOF
+	cat >expect <<-\EOF &&
+	foo1.10
+	foo1.6
+	foo1.3
+	EOF
 	test_cmp expect actual
 '
 
 test_expect_success 'reverse lexical sort' '
 	git tag -l --sort=-refname "foo*" >actual &&
-	cat >expect <<EOF &&
-foo1.6
-foo1.3
-foo1.10
-EOF
+	cat >expect <<-\EOF &&
+	foo1.6
+	foo1.3
+	foo1.10
+	EOF
 	test_cmp expect actual
 '