fix: token button overflow (#3504)

Removes the overflow property from TokenButton, which prevents the vertical scrollbar from rendering.

src/lib/components/TokenSelect/TokenButton.tsx

@@ -24,7 +24,6 @@ const TokenButtonRow = styled(Row)<{ collapsed: boolean }>`
   height: 1.2em;
   // max-width must have an absolute value in order to transition.
   max-width: ${({ collapsed }) => (collapsed ? '1.2em' : '12em')};
-  overflow-x: hidden;
   transition: max-width 0.25s linear;
 `