BW version now has black line

Handles issue #14.

fi-thesis-report.cls

@@ -80,7 +80,10 @@ Autor práce: & \@student
 }
 \vspace{-0.5em}
 \par\noindent
-\textcolor{blue-mu}{\rule{\textwidth}{0.3mm}}
+{%
+\ifthenelse{\equal{\@colorProfile}{bw}}{}{\color{blue-mu}}%
+\rule{\textwidth}{0.3mm}
+}
 \vspace{-0.5em}
 \par\@afterindentfalse\@afterheading
 }