Fix minor search issues

- Reset sorting for a new search
- Descending sort is default for tags

frontend/src/app/containers/search/search.component.ts

@@ -61,12 +61,16 @@ export class SearchComponent implements OnInit {
         {name: 'Price', property: 'average_per_day_costs'}
       ];
 
+      this.sortBy = 'score';
+      this.sortDes = true;
+
       if (this.results.length > 0) {
-        this.results[0].scores.forEach(({type}) => {
+        const tags = await this.ss.getAvailableTags();
+        for (const {type} of this.results[0].scores) {
           if (!this.sortOptions.find(i => i.property === type)) {
-            this.sortOptions.push({name: type, property: type, isScore: true});
+            this.sortOptions.push({name: type, property: type, isScore: true, descending: tags.includes(type)});
           }
-        });
+        }
       }
 
       // Calculate duration