Fix behavior of checkbox selecting on auth settings form (#920)

Now you could change checkbox state by clicking on the correspond `label` of the checkbox.

Co-authored-by: bojeil-google <bojeil-google@users.noreply.github.com>

Author: harrykiselev

demo/public/index.html

@@ -59,9 +59,9 @@ <h4>You are signed out.</h4>
                        value="emailLink">
                 Email Link
               </label><br>
-              <label for="disableEmailSignUpStatus">Disable email sign up:</label>
+              <label for="email-disableSignUp-status">Disable email sign up:</label>
               <input type="checkbox" id="email-disableSignUp-status" name="disableEmailSignUpStatus">
-              <label for="adminRestrictedOperationStatus">Admin restricted operation status:</label>
+              <label for="admin-restricted-operation-status">Admin restricted operation status:</label>
               <input type="checkbox" id="admin-restricted-operation-status" name="adminRestrictedOperationStatus">
             </fieldset>
             <p>