[PDFViewer] Pager tool numeric input overflows the wrapper

[dtopalov]

Describe the bug
When the Toolbar Pager tool is focused (and thus the respective styling is applied) the numeric input overlaps with the wrapper border/outline:

The reason seems to be explicitly removing the whole padding from the .k-pager element when it is within a PDFViewer toolbar:

To reproduce
Steps to reproduce the behavior:

1. Go to https://www.telerik.com/kendo-angular-ui-develop/components/pdfviewer/
2. Tab into the toolbar, when the pager tool wrapper is focused, press Enter to focus the actual Pager component

Expected behavior
There is some padding between the input and the Pager focusable wrapper.