docs/lists.html: adapt google search for lists.busybox.net

Reported by Gordon Smith on the ml.

The mailing list archives are accessed through lists.busybox.net since
the move to osuosl. Adapt the google search box to match.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

docs/lists.html

@@ -22,8 +22,8 @@ list with frequently asked questions...
 
 <center>
 <form method="GET" action="http://www.google.com/custom">
-<input type="hidden" name="domains" value="buildroot.uclibc.org">
-<input type="hidden" name="sitesearch" value="buildroot.uclibc.org">
+<input type="hidden" name="domains" value="lists.busybox.net">
+<input type="hidden" name="sitesearch" value="lists.busybox.net">
 <input type="text" name="q" size="31" maxlength="255" value="">
 <br>
 <input type="submit" name="sa" value="search the mailing list archives">