pandoc: Add math packages to template

pandoc/template.tex

 \documentclass[$if(fontsize)$$fontsize$,$else$12pt,$endif$$for(classoption)$$classoption$$sep$,$endfor$]{fi-thesis-report}
 
+\usepackage{amsmath,amssymb}
+
 % Set types and names
 $if(colorprofile)$\setColorProfile{$colorprofile$}$endif$   % 'color' or 'bw'
 $if(reporttype)$\setReportType{$reporttype$}$endif$   % 'reader' or 'supervisor'