[Desktop] Binance widget should be accessible via tab index

[srirambv]

Description

Binance widget should be accessible via tab index

Steps to Reproduce

1. Connect Binance widget
2. Open a new tab
3. Press tab to select the next element
4. Binance widget isn't focused as there is no input filed in summary view

Actual result:

Binance widget isn't accessible via tab index

Expected result:

Binance widget should be accessible via tab index

Reproduces how often:

Easy

Brave version (brave://version info)

Version/Channel Information:

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

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

[srirambv]

Verification passed on

Brave	1.11.77 Chromium: 83.0.4103.116 (Official Build) beta (64-bit)
Revision	8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{# 716}
OS	Linux

• Verified Binance widget is accessible through tab index
• Logged [Desktop][Follow up to #9256] Tab index should highlight widget contents rather than widget itself  #10508 as a follow up

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Verification passed on

Brave	1.11.77 Chromium: 83.0.4103.116 (Official Build) beta (64-bit)
Revision	8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{# 716}
OS	Windows 10 OS Version 1809 (Build 17763.379)

• Verified Binance widget is accessible through tab index

---

Verification passed on

Brave	1.11.77 Chromium: 83.0.4103.116 (Official Build) beta (64-bit)
Revision	8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{# 716}
OS	macOS Version 10.15.4 (Build 19E287)

• Verified Binance widget is accessible through tab index