Update table font size to be 0.9em of base font size.

base_font_size is 11.5, therefore making table_font_size * 0.9em equates
to 10.35pt.

Author: wmat

themes/riscv-pdf.yml

@@ -294,7 +294,7 @@ figure:
     align: center
 table:
   background_color: $page_background_color
-  font-size: 9
+  font-size: $base_font_size * 0.9em 
   #head_background_color: #2596be
   #head_font_color: $base_font_color
   head_font_style: bold