Reset the Scrollbar position on the DataView Grid at the top when Filter is applied

[N-thony]

Fixes #8116
@rdstern @lloyddewit I made the change so that the scrollbar will always go at the top when the filter is applied. Have a look.

[lloyddewit]

@berylwaswa if you can test, then we can merge, thanks

[rdstern]

@N-thony while you are here could you check the same thing "sideways". I had 34 columns and only saw 30. When I was at Variable 30 I went to the second page it was blank. I think it is ok if I am at variable 1.

I have just confirmed with a blank data frame of 35 variables (if the limit is 30). If I am on Variable x1 and the move to the next page, all is fine.

But if I am on x30, then the next page appears blank. It is ok once I press in the blank data frame. But again it would be good to set back to the first variable visible, before changing the page.

[rdstern]

@N-thony I confirm that the scrolling vertically seems fixed. I then looked at scrolling horizontally with a new data frame of width 54 (my number of variables is set to 50) and hope the same can be done for this?
If you prefer it to be another pull request, then I'll approve this one.

[N-thony]

The solution here fixes the issue but it doesn't solve the problem in the Grid in general because the same problem found with the columns is also with the rows. I will try to fix it more general with the Grid.

[rdstern]

I am approving, because the sideways problem can be in a separate pull request. And it would be good to have this feature fixed in time for the March workshops