hide password field if encryption is none

[shivansh02]

Description

Hides the password fields in repo_add_dialog if Advanced > Encryption: None

Related Issue

#1995 ### Motivation and Context

Helps avoid confusion if a password is needed or not.

How Has This Been Tested?

Tested by me locally.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have read the CONTRIBUTING guide.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

I provide my contribution under the terms of the license of this repository and I affirm the Developer Certificate of Origin.