Clear screen before backup or restore

src/freedombone-controlpanel

@@ -918,6 +918,7 @@ function backup_data {
             rm "$data"
             if [ "$backup_password" ]; then
                 if [ ${#backup_password} -ge 8 ]; then
+                    clear
                     # shellcheck disable=SC2086
                     if /usr/bin/timeout $BACKUP_TIMEOUT_SEC /usr/local/bin/${PROJECT_NAME}-backup-local simple "$backup_password"; then
                         dialog --title $"Backup" \
@@ -1098,6 +1099,7 @@ function restore_data {
             rm "$data"
             if [ "$backup_password" ]; then
                 if [ ${#backup_password} -ge 8 ]; then
+                    clear
                     # shellcheck disable=SC2086
                     if /usr/bin/timeout $BACKUP_TIMEOUT_SEC /usr/local/bin/${PROJECT_NAME}-restore-local simple "$backup_password"; then
                         dialog --title $"Restore" \