Textarea Count functionality: allow using Count min without Count max

When trying to add a counter for the text area using count min functionality (i.e "%d characters/word(s) entered"), you cannot save the element without filling in Count max, which will end up using count max functionality, not min

Based on the snippet below, the intended behavior is correct, but there's another validation done in validateConfigurationForm which doesn't check for counter_minimum. Attaching a patch.

$form['validation']['counter_container']['counter_maximum'] = [
      '#type' => 'number',
      '#title' => $this->t('Count maximum'),
      '#min' => 1,
      '#states' => [
        'required' => [
          ':input[name="properties[counter_type]"]' => ['!value' => ''],
          ':input[name="properties[counter_minimum]"]' => ['value' => ''],
        ],
      ],
    ];