fix direction for line tool

src/canvas_modes.cpp

@@ -291,6 +291,7 @@ void CanvasModeLine::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
             {
                 Canvas::I->stroke_start({ m_drag_start, 0 }, 1.f);
                 Canvas::I->stroke_update({ m_drag_pos, 0 }, 1.f);
+                Canvas::I->stroke_draw();
                 Canvas::I->stroke_end();
             }
             m_dragging = false;