Reset noodle to default position if not connected to another node

include/ui.h

@@ -20,6 +20,7 @@ typedef struct ui_ctx ui_ctx;
 
 enum ui_elem_type {
   UI_ELEM_NODE,
+  UI_ELEM_NOODLE,
   UI_ELEM_BUTTON,
 
   COUNT_UI_ELEM,
@@ -55,6 +56,7 @@ struct ui_ctx {
   bool mouse_down;
   bool mouse_up;
   const window *wnd;
+  ui_elem elements[MAX_UI_ELEMENTS];
 };
 
 void init_ui_ctx(ui_ctx *ctx);