Fix input field value retention issue in self-registration form

[AmshikaH]

Purpose

Fixes the self-registration form's input field value retention issue described in issue wso2/product-is#22195.

Related Issues

• User experience improvements in the self sign up flow product-is#22195

Related PRs

• N/A

Checklist

• e2e cypress tests locally verified. (for internal contributers)
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Relevant backend changes deployed and verified
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines
• Ran FindSecurityBugs plugin and verified report
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets

[wso2-jenkins-bot]

🦋 Changeset detected

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.04%. Comparing base (6380a4e) to head (27e635a).
Report is 39 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7303   +/-   ##
=======================================
  Coverage   36.04%   36.04%           
=======================================
  Files          42       42           
  Lines         899      899           
  Branches      222      205   -17     
=======================================
  Hits          324      324           
- Misses        555      575   +20     
+ Partials       20        0   -20     

Flag	Coverage Δ
@wso2is/core	36.04% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 6 files with indirect coverage changes