fix header-cell dropdowns (for example from filter/select) (#457)

Author: jacekkolasa

src/components/tableV2/core/base-table.js

@@ -121,7 +121,6 @@ Table.HeadCell = forwardRef(
           fontSize: "14px",
         }}
         position="relative"
-        overflow="hidden"
         padding={[1, 2]}
         width={`${width}px`}
         onMouseEnter={() => onHover({ row: null, column: id })}