input_item: remove b_prefers_tree

Nothing uses it and it is irrelevant after tree form and list form
playlist representations were joined.

include/vlc_input_item.h

@@ -86,7 +86,6 @@ struct input_item_t
     vlc_mutex_t lock;                 /**< Lock for the item */
 
     uint8_t     i_type;              /**< Type (file, disc, ... see input_item_type_e) */
-    bool        b_prefers_tree;      /**< Do we prefer being displayed as tree*/
     bool        b_fixed_name;        /**< Can the interface change the name ?*/
     bool        b_error_when_reading;/**< Error When Reading */
 };

src/input/item.c

@@ -858,7 +858,6 @@ input_item_t *input_item_NewWithType( vlc_object_t *p_obj, const char *psz_uri,
     p_input->b_fixed_name = false;
 
     p_input->i_type = i_type;
-    p_input->b_prefers_tree = false;
 
     if( psz_uri )
         input_item_SetURI( p_input, psz_uri );

src/playlist/services_discovery.c

@@ -356,8 +356,6 @@ int playlist_ServicesDiscoveryAdd( playlist_t *p_playlist,
         return VLC_EGENERIC;
     }
 
-    /* We want tree-view for service directory */
-    p_node->p_input->b_prefers_tree = true;
     p_sds->p_sd = p_sd;
     p_sds->p_node = p_node;
     p_sds->psz_name = strdup( psz_name );