message: Fix `suggest-commit-title-limit` input field size
diff: /* Limit width of commit title to 72 characters */
  .rgh-monospace-textareas :is(#merge_title_field, #commit-summary-input) {
  - width: calc(72ch + 18px);
  + width: 72ch;
  max-width: 100%;
  + box-sizing: content-box;
  }
  .rgh-monospace-textareas :is(#merge_title_field, #commit-summary-input, textarea) {
  