Indent switch statement a bit further

This prevents it from being too close to the left edge of the box
and matches the indentation better with the text below.

Author: amadio

talk/basicconcepts/control.tex

@@ -74,7 +74,7 @@
 \begin{frame}[fragile]
   \frametitlecpp[98]{Control structures: switch}
   \begin{block}{Syntax}
-    \begin{cppcode*}{gobble=2}
+    \begin{cppcode*}{gobble=0}
       switch(identifier) {
         case c1 : statements1; break;
         case c2 : statements2; break;