Bug 1634641 - Skip browser_pdfjs_preview.js in asan builds due to frequent failures. r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D82263

browser/components/downloads/test/browser/browser.ini

@@ -20,4 +20,5 @@ skip-if = true # Bug 1352792
 [browser_downloads_panel_height.js]
 [browser_downloads_autohide.js]
 [browser_go_to_download_page.js]
-[browser_pdfjs_preview.js]
+[browser_pdfjs_preview.js]
+skip-if = asan # Bug 1634641