added download_only_mode to encryption configuration

reloading of mp3s/mp4s only happens if file manager is enabled

backend/config/encrypted.json

@@ -16,6 +16,7 @@
       },
       "Extra": {
         "title_top": "Youtube Downloader",
+        "download_only_mode": false,
 		    "file_manager_enabled": true
       }
     }

src/app/app.component.ts

@@ -139,8 +139,10 @@ export class AppComponent implements OnInit {
         }
 
         // reloads mp3s
+        if (this.fileManagerEnabled) {
           this.getMp3s();
         }
+      }
     });
 
   }
@@ -169,8 +171,10 @@ export class AppComponent implements OnInit {
         }
 
         // reloads mp4s
+        if (this.fileManagerEnabled) {
           this.getMp4s();
         }
+      }
     });
 
   }