[onboarding] trailing space username auth bug fix

[theadityaagnihotri]

Description

The username field on the onboarding_screen was giving error general_argument_invalid, Invalid documentId param: UID must contain at most 36 chars. Valid chars are a-z, A-Z, 0-9, and underscore. Can't start with a leading underscore (400) This was happening due to a trailing space in the input which was not accounted for.

Fixes #268

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

The code has been tested on my local machine using an android emulator and now the code is functioning as intended.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings

Maintainer Checklist

• [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
• [ ] Tag the PR with the appropriate labels

[AyaNady17]

Good Work @theadityaagnihotri 🚀

This is good to merge will merge after the previously scheduled PR's are merged

[theadityaagnihotri]

Ok @AyaNady17