[Desktop][CW] Locking account throws error

[srirambv]

Description

Similar to #11269, creating an account and clicking on Lock throws the same error message

Steps to Reproduce

1. Create a new wallet
2. Open Account menu
3. Click lock, page throws error. Try reloading same error

Actual result:

Expected result:

Should lock out of the current session

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.13.69 Chromium: 84.0.4147.125 (Official Build) beta (64-bit)
Revision	d0784639447f2e10d32ebaf9861092b20cfde286-refs/branch-heads/4147@{#1059}
OS	Linux
Component	MM v8 rebase

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 nightly channel? NA

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]

This also happens if you close the browser and restart it

[srirambv]

Verification passed on

Brave	1.13.69 Chromium: 84.0.4147.125 (Official Build) beta (64-bit)
Revision	d0784639447f2e10d32ebaf9861092b20cfde286-refs/branch-heads/4147@{# 1059}
OS	Linux
Component	MM v8 rebase

• Verified error page is not shown when locking the account
• Verified closing and relaunching the page doesn't show the error page

[srirambv]

Verification passed on

Brave	1.12.114 Chromium: 84.0.4147.135 (Official Build) (64-bit)
Revision	c42bd09b3f24da1698d71d3b4f57402137163566-refs/branch-heads/4147@{#1102}
OS	Windows 10 OS Version 1809 (Build 17763.1397)
Component	0.1.67

• Verified error page is not shown when locking the account
• Verified closing and relaunching the page doesn't show the error page

---

Verification passed on

Brave	1.13.75 Chromium: 85.0.4183.69 (Official Build) beta (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	Linux
Component	0.1.67

• Verified error page is not shown when locking the account
• Verified closing and relaunching the page doesn't show the error page

---

Verification passed on

Brave	1.14.55 Chromium: 85.0.4183.69 (Official Build) nightly (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	macOS Version 10.15.5 (Build 19F101)
Component	0.1.67

• Verified error page is not shown when locking the account
• Verified closing and relaunching the page doesn't show the error page

[srirambv]

Fixed via brave/ethereum-remote-client@b6a9d98