Revert "AG-2013 - keep column menus positioned correctly as the grid scrolls"
Revert "AG-2013 - keep column menus positioned correctly as the grid scrolls"

This reverts commit d95281226c96b034d47fbee9cdb24565134f2b4f.

ceolter/ag-grid,ceolter/angular-grid,ceolter/angular-grid,ceolter/ag-grid