remove no-math fontspec option to avoid option clashes

beamerthemeJuelich.sty

 % Latex-Beamer Template Research Centre Juelich
-% version 17.12
+% version 18.08
 % please report any problems to i.kabadshow@fz-juelich.de
 % this version does support pdflatex, xelatex and lualatex
 %
@@ -13,7 +13,7 @@
 
 \ifluatex
   \RequirePackage{microtype}
-  \RequirePackage[no-math]{fontspec}
+  \RequirePackage{fontspec}
   \setmainfont{LiberationSans}
   \setsansfont{LiberationSans}
   \setmonofont{LiberationMono}