t/t8003-blame-corner-cases.sh: Use here documents

Somehow, this test was using:

{
	echo A
	echo B
} > file

block to feed file contents. This changes those to the form most common
in git test scripts:

cat >file <<-\EOF
A
B
EOF

Signed-off-by: Mike Hommey <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: glandium

t/t8003-blame-corner-cases.sh

@@ -41,12 +41,12 @@ test_expect_success setup '
 	test_tick &&
 	GIT_AUTHOR_NAME=Fourth git commit -m Fourth &&
 
-	{
-		echo ABC
-		echo DEF
-		echo XXXX
-		echo GHIJK
-	} >cow &&
+	cat >cow <<-\EOF &&
+	ABC
+	DEF
+	XXXX
+	GHIJK
+	EOF
 	git add cow &&
 	test_tick &&
 	GIT_AUTHOR_NAME=Fifth git commit -m Fifth
@@ -115,24 +115,24 @@ test_expect_success 'append with -C -C -C' '
 test_expect_success 'blame wholesale copy' '
 
 	git blame -f -C -C1 HEAD^ -- cow | sed -e "$pick_fc" >current &&
-	{
-		echo mouse-Initial
-		echo mouse-Second
-		echo mouse-Third
-	} >expected &&
+	cat >expected <<-\EOF &&
+	mouse-Initial
+	mouse-Second
+	mouse-Third
+	EOF
 	test_cmp expected current
 
 '
 
 test_expect_success 'blame wholesale copy and more' '
 
 	git blame -f -C -C1 HEAD -- cow | sed -e "$pick_fc" >current &&
-	{
-		echo mouse-Initial
-		echo mouse-Second
-		echo cow-Fifth
-		echo mouse-Third
-	} >expected &&
+	cat >expected <<-\EOF &&
+	mouse-Initial
+	mouse-Second
+	cow-Fifth
+	mouse-Third
+	EOF
 	test_cmp expected current
 
 '