[6.x] Trigger the grid table mode a bit earlier because it's more useful

[jaygeorge]

Description of the Problem

As mentioned in #14734 v5 triggered the grid table mode at a lower viewport width. Users seem to find this more of a useful view so I've triggered it at a lower breakpoint.

What this PR Does

• Trigger the grid table mode at a lower container query
• Use a container query to alter padding so that the grid table view is more readable

How to Reproduce

1. Add a Grid fieldtype
2. Pull in the window. In v5, it would trigger around a viewport width of 1270px. In v6 it the grid doesn't use a viewport media query—it measures the field's container width via element-container and switches to stacked mode when that width drops below a threshold. I've changed the threshold so it should be more often in grid table mode