TYPO3-13 - Login and "Get Reset Link" button have a missing focus style

When you navigate with your keyboard to an interactive element, you should see a visible focus style. This success criterion helps to know which element has the keyboard focus. The login button doesn't change its style, when it receives focus.

<button class="btn btn-block btn-login t3js-login-submit" id="t3-login-submit" type="submit" name="commandLI" data-loading-text="<i class='fa fa-circle-o-notch fa-spin'></i> Verifying Login Data ..." autocomplete="off">
  Login
</button>

<button class="btn btn-block btn-login" type="submit" name="forgetPasswordSubmit">
  Get Reset Link
</button>

Forge Issue #92620