Update channelunit.helper.php

调整开启绝对路径下，根网址重复问题

src/system/helpers/channelunit.helper.php

@@ -612,7 +612,7 @@ function GetHotKeywords(&$dsql, $num = 8, $nday = 365, $klen = 16, $orderby = 'c
  */
 function Gmapurl($gurl)
 {
-    return preg_match("/http[s]?:\/\//i", $gurl) ? $gurl : $GLOBALS['cfg_basehost'].$gurl;
+    return preg_match("#^(http|https):\/\/#i", $gurl) ? $gurl : $GLOBALS['cfg_basehost'].$gurl;
 }
 /**
  *  引用回复标记处理