Cannot navigate back to shields from blocked script details view

[srirambv]

Description

Cannot navigate back to shields from blocked script details view

Steps to Reproduce

1. Visit any site
2. Enable Block script in shields
3. Click on Scripts blocked
4. Click on Go Back button in details view, doesn't work

Actual result:

https://youtu.be/ISjDaoY_f7A

Expected result:

Should take back to shields overview when Go Back button is clicked in detailed view

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	0.69.77 Chromium: 76.0.3809.62 (Official Build) nightly (64-bit)
Revision	7b77856b3aa34d72f246d12340fc1ded8b2c0e83-refs/branch-heads/3809@{#798}
OS	Linux

Version/Channel Information:

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

Other Additional Information:

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

Miscellaneous Information:

cc: @cezaraugusto @karenkliu

[GeetaSarvadnya]

The issue is reproducible on Windows 10 x64 - 0.69.77

[btlechowski]

Verification passed on

Brave	0.69.110 Chromium: 76.0.3809.100 (Official Build) beta (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#3034
Verified steps from the video https://youtu.be/ISjDaoY_f7A

Verified passed with

Brave	0.69.114 Chromium: 76.0.3809.100 (Official Build) beta (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Mac OS X

• Verified test plan from shields: ensure event target exist before blur happens brave-core#3034

Verification passed on

Brave	0.69.115 Chromium: 76.0.3809.100 (Official Build) beta (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Windows 10 OS Version 1803 (Build 17134.523)

• Verified test plan from shields: ensure event target exist before blur happens brave-core#3034