t/t7003-filter-branch.sh: use the $( ... ) construct for command substitution

diff --git a/t/t5517-push-mirror.sh b/t/t5517-push-mirror.sh
index 12a5dfb17e0a0bd4d0d9636ff13bf44999f78e36..02f160aae0c414411572a99a148d2b039c24fdd3 100755 (executable)
--- a/t/t5517-push-mirror.sh
+++ b/t/t5517-push-mirror.sh
@@ -4,7 +4,7 @@ test_description='pushing to a mirror repository'
 
 . ./test-lib.sh
 
-D=`pwd`
+D=$(pwd)
 
 invert () {
        if "$@"; then