fix: fix error banner alert

[syedsajjadkazmii]

Description

Removing error alert banner on clicking submit button with valid data.

How Has This Been Tested?

Locally

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/2u-vanguards to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 84.22%. Comparing base (80435d3) to head (6764daa).

Files	Patch %	Lines
src/register/RegistrationPage.jsx	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1180      +/-   ##
==========================================
- Coverage   84.33%   84.22%   -0.11%     
==========================================
  Files         127      127              
  Lines        2400     2403       +3     
  Branches      682      683       +1     
==========================================
  Hits         2024     2024              
- Misses        356      359       +3     
  Partials       20       20              

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