Expanded expansion-panels by default

Because of the way the model for the expansion-panels was changed, this is
quite ugly now. Maybe this just shouldn't be an expansion-panel if we want the
content to be visible anyway?

frontend/src/components/submission_type/SubmissionType.vue

@@ -12,7 +12,10 @@
           <v-icon>close</v-icon>
         </v-btn>
       </v-toolbar>
-      <v-expansion-panels v-model="expanded">
+      <v-expansion-panels
+        v-model="expanded"
+        multiple
+      >
         <v-expansion-panel
           v-for="(item, i) in typeItems"
           :key="i"
@@ -117,9 +120,10 @@ export default class SubmissionType extends Vue {
     default: true
   }) closeable!: boolean
 
-  expanded = this.reverse
-    ? [this.expandedByDefault.Description, this.expandedByDefault.Solution]
-    : [this.expandedByDefault.Solution, this.expandedByDefault.Description]
+  expanded = [
+    ...(this.expandedByDefault.Description ? [this.reverse ? 0 : 1] : []),
+    ...(this.expandedByDefault.Solution ? [this.reverse ? 1 : 0] : [])
+  ]
 
   showSolutionComments = true