error modal text is generic when using non KYC bitFlyer wallet

[LaurenWags]

Description

Found while testing #16652

For bitFlyer, when attempting to login with non KYC'd account, the error modal shows a "generic" error instead of the more specific one from brave/brave-core#10469.

Note - this is also how this works with 1.32.x.

Steps to Reproduce

1. Clean profile 1.33.x, set region to Japan, use staging env
2. Enable Rewards
3. Choose to verify with bitFlyer
4. Login with non KYC'd account

Actual result:

Expected result:

Expected the bitFlyer version of the kycRequiredModal from brave/brave-core#10469:

Reproduces how often:

easily

Brave version (brave://version info)

Brave	1.33.83 Chromium: 96.0.4664.45 (Official Build) beta (x86_64)
Revision	76e4c1bb2ab4671b8beba3444e61c0f17584b2fc-refs/branch-heads/4664@{#947}
OS	macOS Version 11.6.1 (Build 20G224)

Version/Channel Information:

• Can you reproduce this issue with the current release? yes 1.32.x
• Can you reproduce this issue with the beta channel? yes 1.33.x
• Can you reproduce this issue with the nightly channel? yes 1.34.x

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 @Miyayes @szilardszaloki

[szilardszaloki]

Asked bitFlyer to make the appropriate changes on their end, so that when a non-KYC'd user hits Cancel on the linkage confirmation screen (which is the only option), they redirect them to brave://rewards/bitflyer/authorization?error=access_denied&state=<state>&error_description=User+does+not+meet+minimum+requirements (instead of brave://rewards/bitflyer/authorization?error=access_denied&state=<state>&error_description=Resource+owner+or+authorization+server+rejected+the+request.).

[LaurenWags]

Verified passed with

Brave | 1.36.86 Chromium: 98.0.4758.87 (Official Build) beta (x86_64)
-- | --
Revision | e4cd00f135fb4d8edc64c8aa6ecbe7cc79ebb3b2-refs/branch-heads/4758@{#1002}
OS | macOS Version 12.2 (Build 21D49)

Verified STR from description.

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