fix: prevent overlapping with other textfields

fix a problem that occurrs in certain situations where it might be an overlapping between textfields in a form

Author: mlopezFC

src/vcf-date-range-picker.js

@@ -121,6 +121,7 @@ import { afterNextRender } from '@polymer/polymer/lib/utils/render-status.js';
         align-self: baseline;
         flex-grow: 1;
         --vaadin-text-field-default-width: 16ch;
+        overflow: hidden;
       }
       [part="dash"][hidden] {
         display: none;