refactor: make start backup red and first button in the page

Author: ethicnology

lib/features/backup_settings/ui/screens/backup_settings_screen.dart

@@ -156,6 +156,7 @@ class _StartBackupButton extends StatelessWidget {
   Widget build(BuildContext context) {
     return SettingsEntryItem(
       icon: Icons.save_as,
+      iconColor: context.appColors.primary,
       title: context.loc.backupSettingsStartBackup,
       onTap: () => context.pushNamed(
         BackupSettingsSubroute.backupOptions.name,