message: Polish `latest-tag-button`
diff: @@ -2,7 +2,7 @@ import './latest-tag-button.css';
  import React from 'dom-chef';
  import cache from 'webext-storage-cache';
  import * as pageDetect from 'github-url-detection';
  -import {DiffIcon, TagIcon} from '@primer/octicons-react';
  +import {GitCompareIcon, TagIcon} from '@primer/octicons-react';
  import features from '.';
  import * as api from '../github-helpers/api';
  @@ -129,7 +129,10 @@ async function init(): Promise<false | void> {
  }
  if (pageDetect.isRepoHome() || onDefaultBranch) {
  - link.append(<sup> {aheadBy === undeterminableAheadBy ? '*' : `+${aheadBy}`}</sup>);
  + if (aheadBy !== undeterminableAheadBy) {
  + link.append(<sup> +{aheadBy}</sup>);
  + }
  +
  link.setAttribute(
  'aria-label',
  isAhead
  @@ -145,7 +148,7 @@ async function init(): Promise<false | void> {
  data-pjax="#repo-content-pjax-container"
  aria-label={`Compare ${latestTag}...${defaultBranch}`}
  >
  - <DiffIcon className="v-align-middle"/>
  + <GitCompareIcon className="v-align-middle"/>
  </a>
  );
  groupButtons([link, compareLink]).classList.add('d-flex');
  