fix(all): buttons are type="button"

core/src/components/picker-column/picker-column.tsx

@@ -330,6 +330,7 @@ export class PickerColumnCmp {
         ref={ el => this.optsEl = el }>
         { col.options.map((o, index) =>
           <Button
+            type="button"
             class={{ 'picker-opt': true, 'picker-opt-disabled': !!o.disabled }}
             disable-activated
             opt-index={index}>