Don't list display_unittests twice for ClangToTLinuxUBSanVptr tester
Don't list display_unittests twice for ClangToTLinuxUBSanVptr tester

Unbreaks that bot after https://codereview.chromium.org/1825723002/ added the
same test a second time, causing:

AssertionError: Triggered same task twice: display_unittests/Ubuntu-12.04/546a7a6818/ClangToTLinuxUBSanVptr tester/363

BUG=597105
TBR=robliao

Review URL: https://codereview.chromium.org/1840233003 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#383955}

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