Improve Settings: Remove username and password requirement for ldap

[fvollmer]

Since 9d62793 anonymous LDAP login is available. Remove username and password requirement in settings dialog.

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[what-the-diff]

PR Summary

• Removal of Validation Rules for Certain Fields
  The rules for checking validity of input data ('validation rules') for the fields ldap_uname and ldap_pword inside the StoreLdapSettings request have been removed. This provides more flexibility while inputting data in these fields.

[snipe]

Hi there - thanks for this! Can you please re-target this PR to point to the develop branch, per our Contributing documentation?

You usually don't need to close and re-open. After you create a pull request, you can modify the base branch so that the changes in the pull request are compared against a different branch. By changing the base branch of your original pull request rather than opening a new one with the correct base branch, you’ll be able to keep valuable work and discussion.

Thanks!

[fvollmer]

I've retarget the pull request and rebased the commit onto the develop branch

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉