Fix breakage on some sites that use addthis scripts

[antonok-edm]

Some websites that use the addthis_widget.js script, e.g. https://www.rhmodern.com/catalog/product/product.jsp?productId=prod14970086&categoryId=cat7150028, do not function as expected.

This is due to an inconsistency between how adblock-rust and uBO handle redirect and important rules. More information on the discrepancy can be found here. This should be fixed by updating adblock-rust.

[btlechowski]

Verification passed on

Brave	1.16.46 Chromium: 86.0.4240.55 (Official Build) nightly (64-bit)
Revision	a6d625ef6f7fe8ea0675f1cf759155a05ee1be40-refs/branch-heads/4240@{#953}
OS	Ubuntu 18.04 LTS

Reproduced the issue on 1.15.x

Verified the test plan from brave/brave-core#6658

Verification PASSED on macOS 10.15.16 x64 using the following version:

Brave | 1.16.47 Chromium: 86.0.4240.55 (Official Build) dev (x86_64)
-- | --
Revision | a6d625ef6f7fe8ea0675f1cf759155a05ee1be40-refs/branch-heads/4240@{#953}
OS | macOS Version 10.15.6 (Build 19G73)

Went through the STR/Cases outlined via brave/brave-core#6658 (comment) as per the following:

Example of 1.15.x	Example of 1.16.x

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Verification passed on

Brave | 1.16.58 Chromium: 86.0.4240.75 (Official Build) dev (64-bit)
-- | --
Revision | c69c33933bfc72a159aceb4aeca939eb0087416c-refs/branch-heads/4240@{#1149}
OS | Windows 10 OS Version 1903 (Build 18362.1082)

Reproduced in 1.15.x

Verified the test plan from brave/brave-core#6658

[srirambv]

Verification passed on the following device running 1.16.69 x64 build

• Verified image is loaded as expected

OnePlus 6T	Samsung Tab A