Remove 2 BAT minimum threshold for connecting/verifying with Uphold

[Miyayes]

Description

Remove 2 BAT minimum threshold for connecting/verifying with Uphold.

[kjozwiak]

The above will require 1.44.83 or higher for 1.44.x verification 👍

[GeetaSarvadnya]

Verification PASSED on

Brave | 1.44.83 Chromium: 105.0.5195.102 (Official Build) beta (64-bit)
-- | --
Revision | 4c16f5ffcc2da70ee2600d5db77bed423ac03a5a-refs/branch-heads/5195_55@{#4}
OS | Windows 10 Version 21H2 (Build 19044.1889)

Went through the Uphold login process on a new profile and ensured there weren't any errors indicating that 2 BAT was needed before being able to signup for an account as per the following:

Example	Example	Example	Example	Example	Example

Also ensured that you can login into previously created accounts without any issues.

[stephendonner]

Verified PASSED using 1.44.86, Chromium 105.0.5195.127 on a Google Pixel XL running Android 9.0.

First, reproduced the issue in current 1.43.89:

example	example

Steps:

1. install 1.44.86
2. launch Brave
3. enable Rewards
4. on brave://rewards, tap on Unverified
5. tap Continue
6. note no message about the 2-BAT-minimum requirement
7. also completed logging in/verifying my Uphold account, on staging, as a regression test

example	example	example