Crypto Wallets login issues when onboarding is not completed

[ryanml]

Description

This is related a bug that was previously fixed pre the v8 MetaMask rebase: #6442

The crux of the issue is that if onboarding isn't marked as completed, login to the UI will not happen (It just gets rejected, no error)

Steps to Reproduce

1. Create a new wallet
2. On the "Confirm your seed phrase" screen, close the tab or navigate elsewhere
3. Go back to brave://wallet, enter your password

Actual result:

Unlock page refreshes with no feedback

Expected result:

You get logged in to your account when adding the correct password

Reproduces how often:

100%

Desktop Brave version:

Android Device details:

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Version/Channel Information:

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

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:

[srirambv]

Verification passed on

Brave	1.17.73 Chromium: 87.0.4280.67 (Official Build) (64-bit)
Revision	0e5d92df40086cf0050c00f87b11da1b14580930-refs/branch-heads/4280@{#1441}
OS	Linux
Component	1.0.17 dev

• Verified steps from issue description
  

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Verification passed on

Brave	1.19.16 Chromium: 87.0.4280.66 (Official Build) nightly (64-bit)
Revision	fd98a29dd59b36f71e4741332c9ad5bda42094bf-refs/branch-heads/4280@{#1432}
OS	Windows 10 OS Version 1809 (Build 17763.1577)
Component	1.0.17 dev

• Verified steps from issue description
  

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Verification passed on

Brave	1.18.56 Chromium: 87.0.4280.60 (Official Build) dev (x86_64)
Revision	12697cfeb273d7de95cf9b18350d2c457f58224c-refs/branch-heads/4280@{#1352}
OS	macOS Version 10.15.7 (Build 19H2)
Component	1.0.17 dev

• Verified steps from issue description