Revert accidental change to Python example

This was done way back in f84342a30 (Modified parameter handling using
typemaps. 'Reference' example. Visibility hint now applies only to the
global functions., 2008-06-28), surely accidentally.

Examples/python/class/example.i

@@ -5,9 +5,5 @@
 #include "example.h"
 %}
 
-%typemap(in) double {
-  /* hello */
-}
-
 /* Let's just grab the original header file here */
 %include "example.h"