fix(settings): remove excessive email validation in user settings

[MaxPostema]

fixes: #4237

What are the main changes you did:

• explain what you changed and essential considerations.

how to test:

• explain here what to do to test this (or point to unit tests)

todo:

• [ ] updated docs in case of new feature
• [ ] added/updated tests
• [ ] added/updated testplan to include a test for this fix, including ref to bug using # notation

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud