added download_only_mode to encryption configuration

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

backend/config/encrypted.json

@@ -16,7 +16,8 @@
       },
       "Extra": {
         "title_top": "Youtube Downloader",
-		"file_manager_enabled": true
+        "download_only_mode": false,
+		    "file_manager_enabled": true
       }
     }
   }

src/app/app.component.ts

@@ -139,7 +139,9 @@ export class AppComponent implements OnInit {
         }
 
         // reloads mp3s
-        this.getMp3s();
+        if (this.fileManagerEnabled) {
+          this.getMp3s();
+        }
       }
     });
 
@@ -169,7 +171,9 @@ export class AppComponent implements OnInit {
         }
 
         // reloads mp4s
-        this.getMp4s();
+        if (this.fileManagerEnabled) {
+          this.getMp4s();
+        }
       }
     });