enable enter key submission on login

[angela-lee1]

Fixes #1919

What changes did you make and why did you make them?

• Enable enter key submission on the admin login page

[trillium]

He Angela, thanks for your work here.

This looks a little overengineered, overall we prefer to continue to use built in HMTL functionality to submit the form. It looks like we just need to wrap the FormControl component and a form component and then we should be good.

Make sure to move the properties from the FormControl component into the form component

// Move from <FormControl> to <form>
          onSubmit={handleLogin}
          className="form-check-in"
          autoComplete="off"

[angela-lee1]

@trillium, @JackHaeg, I made changes per your comments. Please take a look at it when you have a chance. Thanks.

[trillium]

Thanks for making these changes, approved :)