Fix vertical positioning of Start block, when bringing it out of the toolbox pane.
Fix vertical positioning of Start block, when bringing it out of the toolbox pane.

CelineBoudier/rapid-router,CelineBoudier/rapid-router,mikebryant/rapid-router,CelineBoudier/rapid-router,CelineBoudier/rapid-router,mikebryant/rapid-router,mikebryant/rapid-router,mikebryant/rapid-router