Bug 1546930 - disable browser_toggleTransparentOverlay-2.js on linux_18.04_64 for frequent failures. r=intermittent-reviewers,bhearsum DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D124586

toolkit/components/pictureinpicture/tests/browser.ini

@@ -101,5 +101,6 @@ skip-if = os == 'linux' # Bug 1546455
 skip-if =
   os == 'linux' && bits == 64 && webrender # Bug 1552288
 [browser_toggleTransparentOverlay-2.js]
-skip-if = os == 'linux' && (debug || asan) # Bug 1546930
+skip-if = 
+  os == 'linux' && bits == 64 && os_version == '18.04' # Bug 1546930
 [browser_videoSelection.js]