Custom notifications are shifted to the left on Windows 7 and 8

[btlechowski]

The shift to the left was introduced to accommodate native (system) notifications.
Windows 7 and 8 don't have native (system) notifications so the shift is not needed

Steps to Reproduce

1. Clean profile
2. Enable rewards and ads
3. Trigger custom ad notification

Actual result:

Custom notifications are shift to the left on Windows 7 and 8

Expected result:

Custom notifications are not shifted left on Windows 7 and 8

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.34.63 Chromium: 96.0.4664.110 (Official Build) beta (64-bit)
Revision	d5ef0e8214bc14c9b5bbf69a1515e431394c62a6-refs/branch-heads/4664@{#1283}
OS	Ubuntu 18.04 LTS

cc @brave/legacy_qa @tmancey @jsecretan

[tmancey]

This should be resolved via Griffin

[tmancey]

Closing issue as Chromium 109 drops support for Windows 7/8/8.1