Map Timeframe: fix second Apply need to disabled.

src/components/Discover/Map/SidebarFilter.vue

@@ -248,7 +248,7 @@ export default {
           disabled = false;
           break;
         case 'Timeframes': // Filter Type 選 Timeframes 的行為
-          disabled = false;
+          if(this.selectTimeFrame.length > 0) disabled = false;
           break;
       }
       this.isDisabled = disabled;