Fix missing max_id in API search calls

actions/twitapisearchatom.php

@@ -169,6 +169,7 @@ class TwitapisearchatomAction extends TwitterapiAction
         $this->cnt = $notice->find();
 
         $cnt = 0;
+        $this->max_id = 0;
 
         while ($notice->fetch()) {
 

lib/jsonsearchresultslist.php

@@ -89,6 +89,7 @@ class JSONSearchResultsList
     function show()
     {
         $cnt = 0;
+        $this->max_id = 0;
 
         $time_start = microtime(true);