Fix PHP warning

main/messages/inbox.php

@@ -142,7 +142,7 @@ if (api_get_setting('allow_social_tool') == 'true') {
     $social_right_content .= '<a href="'.api_get_path(WEB_PATH).'main/messages/new_message.php?f=social">'.Display::return_icon('compose_message.png', get_lang('ComposeMessage'), array(), 32).'</a>';
     $social_right_content .= '<a href="'.api_get_path(WEB_PATH).'main/messages/outbox.php?f=social">'.Display::return_icon('outbox.png', get_lang('Outbox'), array(), 32).'</a>';
 
-    $form = MessageManager::getSearchForm();
+    $form = MessageManager::getSearchForm(api_get_path(WEB_PATH).'main/messages/inbox.php');
     if ($form->validate()) {
         $values = $form->getSubmitValues();
         $keyword = $values['keyword'];

main/messages/outbox.php

@@ -117,7 +117,7 @@ if (api_get_setting('allow_social_tool') == 'true') {
     $social_right_content .= '<div class="actions">';
     $social_right_content .= '<a href="'.api_get_path(WEB_PATH).'main/messages/inbox.php?f=social">'.Display::return_icon('back.png', get_lang('Back'), array(), 32).'</a>';
 
-    $form = MessageManager::getSearchForm();
+    $form = MessageManager::getSearchForm(api_get_path(WEB_PATH).'main/messages/outbox.php');
     if ($form->validate()) {
         $values = $form->getSubmitValues();
         $keyword = $values['keyword'];