Fix VR PRESUBMIT adding wrong bot

Switches the addition of the optional linux_vr bot to the luci version
instead of the now-broken master.tryserver.chromium.linux one.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:linux_vr;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ib070bd9ad8eb72be068758d194dcedef01d7d325
Reviewed-on: https://chromium-review.googlesource.com/1102897Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567738}

chrome/browser/vr/PRESUBMIT.py

@@ -61,6 +61,6 @@ def PostUploadHook(cl, change, output_api):
       'luci.chromium.try:mac_optional_gpu_tests_rel',
       'luci.chromium.try:win_optional_gpu_tests_rel',
       'luci.chromium.try:android_optional_gpu_tests_rel',
-      'master.tryserver.chromium.linux:linux_vr',
+      'luci.chromium.try:linux_vr',
     ],
     'Automatically added optional GPU tests to run on CQ.')