Table classes don't display in export formats for Jacobs theme

[mcgratay]

Description

Borders or lines for table classes don't export to PDF or ebook formats when users have selected the Jacobs theme. No tables, including "full grid" and "lines" tables, have any borders or lines. The tables do appear to still have background colors per their class, however.

How tables appear in the webbook (correct):

How tables appear in the PDF (incorrect):

Example: https://jacobsthemetables.textopress.com

Steps to Reproduce

1. Create a new chapter in your book and add a table
2. Click inside the table, then select the table icon from the visual editor and go to the Table Properties menu
3. Select a class (ex: full grid) from the Class dropdown menu
4. Save changes to settings and for the chapter
5. Export to PDF and EPUB

Expected behavior: Tables which have classes designed with borders and lines still have those borders in export formats

Actual behavior: Tables in the Jacobs theme do not have borders and lines in export formats

[SteelWagstaff]

Similar issue fixed for Clarke here: pressbooks/pressbooks-clarke#49