Make inline tipping icon clickable on old reddit

[btlechowski]

On old reddit BAT icon is not clickable.
Combined with #12264, it makes impossible to tip on old reddit

Steps to Reproduce

1. Enable Rewards on staging
2. Open https://old.reddit.com/user/alex_the_brave
3. Click the BAT icon on an inline tip

Actual result:

BAT icon is not clickable
Cannot tip when Combined with #12264, it makes impossible to tip on old reddit

Expected result:

BAT icon is clickable
Can tip through Bat icon

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.17.63 Chromium: 87.0.4280.49 (Official Build) dev (64-bit)
Revision	f77f85899646b42a1d3c8ff36794e00becab9171-refs/branch-heads/4280@{#1115}
OS	Ubuntu 18.04 LTS

Brave	1.18.43 Chromium: 87.0.4280.49 (Oficjalna wersja) nightly (64-bitowa)
Wersja	f77f85899646b42a1d3c8ff36794e00becab9171-refs/branch-heads/4280@{#1115}
System operacyjny	Windows 7 Service Pack 1 (Build 7601.24544)

cc @brave/legacy_qa @rebron @NejcZdovc @emerick