Tipping banner always shows a disabled vertical scrollbar

[btlechowski]

Steps to Reproduce

1. Enable rewards
2. Go to a page (I used interia.pl)
3. Tip the page

Actual result:

Tipping banner always shows a disabled vertical scrollbar

Expected result:

Vertical scrollbar is shown only when needed

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	0.69.130 Chromium: 77.0.3865.90 (Official Build) (64-bit)
Revision	58c425ba843df2918d9d4b409331972646c393dd-refs/branch-heads/3865@{#830}
OS	Ubuntu 18.04 LTS

Version/Channel Information:

• Can you reproduce this issue with the current release? yes
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the dev channel? yes
• Can you reproduce this issue with the nightly channel? yes

cc @brave/legacy_qa @cg505 @NejcZdovc @ryanml

[btlechowski]

Still reproducible

Brave	0.72.124 Chromium: 78.0.3904.97 (Official Build) beta (64-bit)
Revision	021b9028c246d820be17a10e5b393ee90f41375e-refs/branch-heads/3904@{#859}
OS	Ubuntu 18.04 LTS

cc @rebron

[btlechowski]

Thanks for fixing. Looks good.

Verification passed on

Brave	1.3.81 Chromium: 79.0.3945.88 (Official Build) beta (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#4005

Verified passed with

Brave	1.3.85 Chromium: 79.0.3945.88 (Official Build) beta (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	macOS Version 10.14.6 (Build 18G103)

• Verified test plan from Fixes scrollbar on site banner brave-core#4005

Verified for a KYC'd publisher (one time and monthly tip banners):

Verified for a connected publisher, not KYC'd (one time and monthly tip banners):

Verified for an unverified publisher (one time and monthly tip banners):

Verification passed on

Brave	1.3.87 Chromium: 79.0.3945.117 (Official Build) beta (64-bit)
Revision	04f0a055010adab4484f7497fbfdbf312c307f1d-refs/branch-heads/3945@{#1019}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified test plan from Fixes scrollbar on site banner brave-core#4005
  Verified for unverified publisher (one time and monthly tip banners):
  
  

Verified for a KYC'd publisher (one time and monthly tip banners):


Verified for a connected publisher (not KYC'd) (one time and monthly tip banners):