Remove urlencode('K') in pkg_search_results.

The urlencoded string should only be used for href, but it was being
applied and used in printed output, like the keywords textbox.

This fixes a problem that was reported in
FS#12791 - Faster navigation withing package search listing by page numbers
Signed-off-by: Loui Chang <louipc.ist@gmail.com>

web/template/pkg_search_results.php

-<?php
-# Encode search string
-$_GET['K'] = urlencode($_GET['K']);
-?>
 <form action='packages.php?<?php print $_SERVER['QUERY_STRING'] ?>' method='post'>
 <center>