Settings WebUI: Re-enable People page tests for Polymer 2.

These seem to have been fixed at r591110, but they were not properly re-enabled.

Bug: 875452
Change-Id: Icdab27f5afd81a8e8c2c7a30b1ab76ec05ee8d8e
Reviewed-on: https://chromium-review.googlesource.com/1235285Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592855}

testing/buildbot/filters/webui_polymer2_browser_tests.filter

@@ -191,6 +191,8 @@ CrSettingsPaymentsSectionTest.*
 CrSettingsPeoplePageChangePictureTest.*
 CrSettingsPeoplePageManageProfileTest.*
 CrSettingsPeoplePageSetupPinDialogTest.*
+CrSettingsPeoplePageSyncPageTest.*
+CrSettingsPeoplePageTest.*
 CrSettingsPersonalizationOptionsTest.*
 CrSettingsPrefsTest.*
 CrSettingsPrefUtilTest.*