fix browserstack tests NaNs. AG-9006

Merge in ADGUARD-FILTERS/scriptlets from fix/AG-9006 to master

Squashed commit of the following:

commit a86056f
Author: Slava Leleka <v.leleka@adguard.com>
Date:   Mon Jul 12 14:12:24 2021 +0300

    do not use test.only()

Author: slvvko