Bug 1831046 - Fix test_file_put_deleted.html failure when IDB uses the private repository; r=hsingh

Differential Revision: https://phabricator.services.mozilla.com/D176991

dom/indexedDB/test/test_file_put_deleted.html

@@ -83,7 +83,7 @@
     // (We want to chop off the profile root and the resulting path component
     // must not start with a directory separator.)
     let fileRelPath =
-      fileFullPath.substring(fileFullPath.search(/[/\\]storage[/\\]default(?:-private)?[/\\]/) + 1);
+      fileFullPath.substring(fileFullPath.search(/[/\\]storage[/\\](default|private)[/\\]/) + 1);
     info("trying to delete: " + fileRelPath);
     // by using the existing SpecialPowers mechanism to create files and clean
     // them up.  We clobber our existing content, then trigger deletion to