Remove unused property

app/src/main/java/org/jellyfin/mobile/app/AppPreferences.kt

@@ -30,15 +30,6 @@ class AppPreferences(context: Context) {
             }
         }
 
-    @Deprecated(message = "Deprecated in favor of SQLite database - only kept for migration reasons")
-    var instanceUrl: String?
-        get() = sharedPreferences.getString(Constants.PREF_INSTANCE_URL, null)
-        set(value) {
-            sharedPreferences.edit {
-                if (value != null) putString(Constants.PREF_INSTANCE_URL, value) else remove(Constants.PREF_INSTANCE_URL)
-            }
-        }
-
     var ignoreBatteryOptimizations: Boolean
         get() = sharedPreferences.getBoolean(Constants.PREF_IGNORE_BATTERY_OPTIMIZATIONS, false)
         set(value) {