tests: allow sha1's as part of the path

When running 'make test' from a path such as
.../daily-build/master@bdff0e3a374617dce784f801b97500d9ba2e4705, the
logic in fuzz.sed as generated by t5105-request-pull.sh was backwards,
replacing object names before replacing urls, making the test fail.

Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5150-request-pull.sh

@@ -80,12 +80,12 @@ test_expect_success 'setup: two scripts for reading pull requests' '
 
 	cat <<-EOT >fuzz.sed
 	#!/bin/sed -nf
+	s/$downstream_url_for_sed/URL/g
 	s/$_x40/OBJECT_NAME/g
 	s/A U Thor/AUTHOR/g
 	s/[-0-9]\{10\} [:0-9]\{8\} [-+][0-9]\{4\}/DATE/g
 	s/        [^ ].*/        SUBJECT/g
 	s/  [^ ].* (DATE)/  SUBJECT (DATE)/g
-	s/$downstream_url_for_sed/URL/g
 	s/for-upstream/BRANCH/g
 	s/mnemonic.txt/FILENAME/g
 	s/^version [0-9]/VERSION/