Fix excessive highlighting on hover

It fixes whitespace on left when being highlighted when hovering on macOS (OS selection button on top)
The commit also unifies the way top menu buttons are displayed by reusing `MenuOptionListItem`s (renamed from `SelectableOption`) and `MenuOptionList`. This ensures right and consistent behavior.
Finally it fixes `enabled` property in menu option setting disabled state instead.

src/presentation/components/Scripts/Menu/Grouping/TheGrouper.vue

@@ -1,26 +1,38 @@
 <template>
     <div class="container">
-        <span class="part">Group by:</span>
+        <MenuOptionList
+            label="Group by"
+            class="part">
+            <MenuOptionListItem
+                label="Cards"
+                :enabled="!cardsSelected"
+                @click="groupByCard()"
+            />
+            <MenuOptionListItem
+                label="None"
+                :enabled="!noneSelected"
+                @click="groupByNone()"
+            />
+        </MenuOptionList>
         <span class="part">
-            <span 
-                class="part"
-                v-bind:class="{ 'disabled': cardsSelected, 'enabled': !cardsSelected}"
-                @click="groupByCard()">Cards</span>
-            <span class="part">|</span>
-            <span class="part"
-                v-bind:class="{ 'disabled': noneSelected, 'enabled': !noneSelected}"
-                @click="groupByNone()">None</span>
-            </span>
+        </span>
     </div>
 </template>
 
 <script lang="ts">
 import { Component, Vue } from 'vue-property-decorator';
 import { Grouping } from './Grouping';
+import MenuOptionList from './../MenuOptionList.vue';
+import MenuOptionListItem from './../MenuOptionListItem.vue';
 
 const DefaultGrouping = Grouping.Cards;
 
-@Component
+@Component({
+  components: {
+    MenuOptionList,
+    MenuOptionListItem,
+  },
+})
 export default class TheGrouper extends Vue {
     public cardsSelected = false;
     public noneSelected = false;
@@ -50,29 +62,5 @@ export default class TheGrouper extends Vue {
 </script>
 
 <style scoped lang="scss">
-@import "@/presentation/styles/colors.scss";
-@import "@/presentation/styles/fonts.scss";
-
-.container {
-    display: flex;
-    flex-direction: row;
-    flex-wrap: wrap;
-    font-family: $normal-font;
-    .part {
-        display: flex;
-        margin-right:5px;
-    }
-}
-
-.enabled {
-    cursor: pointer;
-    &:hover {
-        font-weight:bold;
-        text-decoration:underline;
-    }
-}
-.disabled {
-    color:$gray;
-}
 
 </style>