Remove useless check for hover option in the indexable definition for doughnut

src/controllers/controller.doughnut.js

@@ -76,7 +76,7 @@ export default class DoughnutController extends DatasetController {
 
   static descriptors = {
     _scriptable: (name) => name !== 'spacing',
-    _indexable: (name) => name !== 'spacing' && !name.startsWith('borderDash') && !name.startsWith('hoverBorderDash'),
+    _indexable: (name) => name !== 'spacing' && !name.startsWith('borderDash'),
   };
 
   /**

src/elements/element.arc.ts

@@ -284,7 +284,7 @@ export default class ArcElement extends Element<ArcProps, ArcOptions> {
 
   static descriptors = {
     _scriptable: true,
-    _indexable: (name) => name !== 'borderDash'
+    _indexable: (name) => !name.startsWith('borderDash')
   };
 
   circumference: number;

test/fixtures/controller.doughnut/borderDash/hover.js

@@ -0,0 +1,43 @@
+module.exports = {
+  config: {
+    type: 'polarArea',
+    data: {
+      labels: [0, 1, 2, 3, 4, 5],
+      datasets: [
+        {
+          // option in dataset
+          data: [5, 2, 4, 7, 6, 8],
+          borderAlign: 'inner',
+          borderColor: 'black'
+        },
+      ]
+    },
+    options: {
+      events: [],
+      elements: {
+        arc: {
+          backgroundColor: 'transparent',
+          borderWidth: 1,
+          hoverBorderDash: [3, 3]
+        }
+      },
+      scales: {
+        r: {
+          display: false
+        }
+      }
+    }
+  },
+  options: {
+    canvas: {
+      height: 256,
+      width: 512
+    },
+    run(chart) {
+      chart.setActiveElements([
+        {datasetIndex: 0, index: 0}, {datasetIndex: 0, index: 3}
+      ]);
+      chart.update();
+    }
+  }
+};

test/fixtures/controller.polarArea/borderDash/hover.js

@@ -0,0 +1,43 @@
+module.exports = {
+  config: {
+    type: 'polarArea',
+    data: {
+      labels: [0, 1, 2, 3, 4, 5],
+      datasets: [
+        {
+          // option in dataset
+          data: [5, 2, 4, 7, 6, 8],
+          borderAlign: 'inner',
+          borderColor: 'black'
+        },
+      ]
+    },
+    options: {
+      events: [],
+      elements: {
+        arc: {
+          backgroundColor: 'transparent',
+          borderWidth: 1,
+          hoverBorderDash: [3, 3]
+        }
+      },
+      scales: {
+        r: {
+          display: false
+        }
+      }
+    }
+  },
+  options: {
+    canvas: {
+      height: 256,
+      width: 512
+    },
+    run(chart) {
+      chart.setActiveElements([
+        {datasetIndex: 0, index: 0}, {datasetIndex: 0, index: 3}
+      ]);
+      chart.update();
+    }
+  }
+};