veyron/tools/identity: Remove REPO_ROOT reference that was re-merged after deletion.

Change-Id: Idfb9b1bac99343745f2fb59bfaa2aaf806edc0e8
diff --git a/tools/identity/test.sh b/tools/identity/test.sh
index ad1dc4e..e404328 100755
--- a/tools/identity/test.sh
+++ b/tools/identity/test.sh
@@ -40,7 +40,7 @@
   # To regenerate testdata:
   # identity generate "root" >testdata/root.id
   # identity generate "other" | VEYRON_IDENTITY=testdata/root.id identity bless - "blessed" >testdata/blessed.id
-  local -r TESTDATA_DIR="${REPO_ROOT}/go/src/veyron/tools/identity/testdata"
+  local -r TESTDATA_DIR="${VEYRON_ROOT}/veyron/go/src/veyron/tools/identity/testdata"
   GOT=$(VEYRON_IDENTITY="${TESTDATA_DIR}/root.id" ./identity print | awk '/Name/ {print $3}')
   WANT="root"
   if [ "${GOT}" != "${WANT}" ]; then