t5510: consolidate 'grep' and 'test_i18ngrep' patterns

One of the tests in 't5510-fetch.sh' checks the output of 'git fetch'
using 'test_i18ngrep', and while doing so it prefilters the output
with 'grep' before piping the result into 'test_i18ngrep'.

This prefiltering is unnecessary, with the appropriate pattern
'test_i18ngrep' can do it all by itself.  Furthermore, piping data
into 'test_i18ngrep' will interfere with the linting that will be
added in a later patch.

Signed-off-by: SZEDER Gábor <[email protected]>
Reviewed-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: szeder

t/t5510-fetch.sh

@@ -222,12 +222,9 @@ test_expect_success 'fetch uses remote ref names to describe new refs' '
 	(
 		cd descriptive &&
 		git fetch o 2>actual &&
-		grep " -> refs/crazyheads/descriptive-branch$" actual |
-		test_i18ngrep "new branch" &&
-		grep " -> descriptive-tag$" actual |
-		test_i18ngrep "new tag" &&
-		grep " -> crazy$" actual |
-		test_i18ngrep "new ref"
+		test_i18ngrep "new branch.* -> refs/crazyheads/descriptive-branch$" actual &&
+		test_i18ngrep "new tag.* -> descriptive-tag$" actual &&
+		test_i18ngrep "new ref.* -> crazy$" actual
 	) &&
 	git checkout master
 '