fix: identation of sample code

slides/common/Fine_Tuning.tex

@@ -47,7 +47,7 @@ \section{Fine Tuning Cluster Behaviour}
    \end{lstlisting}	
    The value may be a fraction (here: 1 job per ten seconds). Or simply
    \begin{lstlisting}[language=Bash, style=Shell]
-   	$ snakemake --max-job-per-second=5
+$ snakemake --max-job-per-second=5
    \end{lstlisting}
    which would half the submission rate (5 instead of 10)
 \end{frame}