Fix bug changement default view

- It was impossible to set default view to "Show all articles"
- "0" was compared to 0 ("O" === 0 => false)
- cast value from Minz_Request into integer

app/Controllers/configureController.php

@@ -181,7 +181,7 @@ class FreshRSS_configure_Controller extends Minz_ActionController {
 		if (Minz_Request::isPost()) {
 			$this->view->conf->_posts_per_page(Minz_Request::param('posts_per_page', 10));
 			$this->view->conf->_view_mode(Minz_Request::param('view_mode', 'normal'));
-			$this->view->conf->_default_view(Minz_Request::param('default_view', 'a'));
+			$this->view->conf->_default_view((int)Minz_Request::param('default_view', FreshRSS_Entry::STATE_ALL));
 			$this->view->conf->_auto_load_more(Minz_Request::param('auto_load_more', false));
 			$this->view->conf->_display_posts(Minz_Request::param('display_posts', false));
 			$this->view->conf->_onread_jump_next(Minz_Request::param('onread_jump_next', false));