fix(dia.ToolsView): make sure tools are rendered before the first update

[kumilingus]

Description

PR ensures that update() of tools is called after they are rendered.

paper.freeze();
const remove = new joint.linkTools.Vertices();
const toolsView = new joint.dia.ToolsView({ tools: [remove] });
linkView.addTools(toolsView);
linkView.hideTools();
paper.unfreeze();
// ASSERT: the tools are not rendered yet
linkView.showTools();
// ASSERT: tools are now rendered (previously an update was called without the tools being correctly rendered)