DOTCODE: Fix best_mask -> high_score prime test; manual mask

backend/library.c

@@ -677,6 +677,7 @@ unsigned int ZBarcode_Cap(int symbol_id, unsigned int cap_flag) {
             case BARCODE_QRCODE:
             case BARCODE_MICROQR:
             case BARCODE_HANXIN:
+            case BARCODE_DOTCODE:
                 result |= ZINT_CAP_MASK;
                 break;
         }