Remove commented out testcase line

We'd expect char* typemaps to terminate the string at NUL, as the
enabled version of this line tests.

Looking at the history this seems to just be a left-over from original
development.

See #2608

Examples/test-suite/python/char_binary_runme.py

@@ -32,7 +32,6 @@ if cvar.var_pchar != "hola":
     raise RuntimeError("bad pointer case {}".format(cvar.var_pchar))
 
 cvar.var_namet = pc
-# if cvar.var_namet != "hola\0":
 if cvar.var_namet != "hola":
     raise RuntimeError("bad pointer case")