ENYO-2151: Small bug fix in Drag&Drop feature for project file tree

Tested Browsers (under Windows 7 Entreprise) are: FireFox 21, Chrome, Chrome Canary, Opera, Safari 4 Windows & IE 10
Ready to be merged

* ENYO-2151: Bad cursor style applying fixed as the mouse leaves a node by the right and goes to another one
* ENYO-2151: apply better code style

Enyo-DCO-1.1-Signed-off-by: Vincent HERILIER <vincent.herilier@hp.com>