update iOS project

src/canvas.cpp

@@ -1448,6 +1448,7 @@ void Canvas::FloodData::apply()
         layer->m_dirty_face[plane] = true;
         layer->m_dirty_box[plane] = box_union(layer->m_dirty_box[plane], bb[plane]);
     }
+    Canvas::I->m_unsaved = true;
 }
 
 void Canvas::resize(int width, int height)