Fix tokens-tab hard scroll and hidden rows

The current strategy was to add a fixed flex tab in order to have the sticky header sections on the container. This was adding a rendering issue to the tabs external tabs causing the hard-scroll and also not showing the bottom transaction rows.

This can be restructured in order to follow a clear new set of UI/UX guidelines but for a quick fix, removing the flex view approach clear all critical issues for the user.

Closes #3252 (closed)