Fix DX12 VK release args

Fixes gpu_fyi_tests_dx12vk_release_trybot missing "release_trybot" in
mb_config.pyl.

Bug: 1010584
Change-Id: If95a5e98212ee0015550857af41f78b88e99b945
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881346Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709602}

tools/mb/mb_config.pyl

@@ -1594,7 +1594,7 @@
     ],
 
     'gpu_fyi_tests_dx12vk_release_trybot': [
-      'gpu_fyi_tests', 'dx12vk',
+      'gpu_fyi_tests', 'dx12vk', 'release_trybot',
     ],
 
     'gpu_tests_android_release_bot_minimal_symbols_arm64': [