fix(accidental-hover): support shorthand media features

Media Queries Level 4
(https://drafts.csswg.org/mediaqueries-4/#mq-features) provides a
shorthand syntax for boolean media features such as (hover: hover) -
you can omit the feature value and write it simply as (hover).

src/rules/use-defensive-css/index.js

@@ -38,7 +38,10 @@ function traverseParentRules(parent) {
   }
 
   if (parent.parent.type === 'atrule') {
-    if (parent.parent.params && parent.parent.params.includes('hover: hover')) {
+    if (
+      parent.parent.params &&
+      /\(hover(: hover)?\)/.test(parent.parent.params)
+    ) {
       isWrappedInHoverAtRule = true;
     } else {
       traverseParentRules(parent.parent);

src/rules/use-defensive-css/index.test.js

@@ -14,6 +14,10 @@ testRule({
       code: `@media (hover: hover) { .btn:hover { color: black; } }`,
       description: 'Use media query for button hover state.',
     },
+    {
+      code: `@media (hover) { .btn:hover { color: black; } }`,
+      description: 'Use shorthand media query for button hover state.',
+    },
     {
       code: `@media (min-width: 1px) { @media (hover: hover) { .btn:hover { color: black; } } }`,
       description: 'Use nested media queries for button hover state.',