Add styling for tables in content

Problem

Tables in content (e.g. topic bodies) aren't styled by default which makes them difficult to read.

Solution

Adding a class to user content isn't simple so extending the selector from .table (elements with the class table) to also include .page-node .body-text table (table elements in elements with the body-text class of node pages) ensures that they're properly styled when using socialbase as a theme.