MPDF Issues

1. Task Exports: This commit fixes the contructor for printing Tasks using MPDF

2. PDF Formatting: This commit fixes an issue where the header of each thread entry did not stretch across the page correctly. This was an unintentional side effect of trying to fix the way HTML tables printed in PDFs.

3. FAQ PDFs: This commit passes the correct values to mPDFWithLocalImages when printing FAQs