disable bio auth for macos (#1138)

* disable bio auth for macos

* Disable for Linux as well

---------

Co-authored-by: fossephate <fosse@book.local>
Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

lib/core/backup_service.dart

@@ -285,7 +285,7 @@ class BackupService {
       await _sharedPreferences.setInt(
           PreferencesKey.currentTransactionPriorityKeyLegacy, currentTransactionPriorityKeyLegacy);
 
-    if (allowBiometricalAuthentication != null)
+    if (allowBiometricalAuthentication != null && !Platform.isMacOS && !Platform.isLinux)
       await _sharedPreferences.setBool(
           PreferencesKey.allowBiometricalAuthenticationKey, allowBiometricalAuthentication);