LP#1794176 Avoid capturing grid cell tooltip/display values

LP#1794176 Avoid capturing grid cell tooltip/display values

Remove the grid-tooltip logic that captured the cell content into a
template-level variable so the content only needed to be generated once
for both the tooltip and cell display.  This logic fails to handle cases
where the cell content is dynamic, typically the result of row
attributes being modified via external process.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Conflicts:
	Open-ILS/src/templates/staff/share/t_autogrid.tt2

Signed-off-by: Dan Wells <dbw2@calvin.edu>