BUG #15058: Fixes unclipped grid.

vtkChartXY wouldn't clip the grid. There doesn't seem to be a good
reason for that. We should clip the grid to match
clipping/transformation used by the axes and other plots. This avoid
visualization where the grid extends beyond the axes/plots.

Change-Id: I5bd43f65f27f437832bf33ef6230084de7988367
Merge topic '15058_fix_grid_clipping' into master

25e39389 BUG #15058: Fixes unclipped grid.