PATCH: Remove irrelevant code from maildropfilter example

The four lines removed here appear verbatim in a block under the
"Environment" heading, but appear to be redundant here. This is perhaps
a copy-paste error.

Author: tejr

maildrop/maildropfilter.sgml

@@ -209,10 +209,6 @@ DEFAULT=$SAVEDEFAULT
 	<informalexample>
 	  <programlisting>
 FOOBAR="Foo"'bar'
-SAVEDEFAULT=$DEFAULT
-import DEFAULT
-LOCALDEFAULT=$DEFAULT
-DEFAULT=$SAVEDEFAULT
 	  </programlisting>
 	</informalexample>
       </blockquote>