Build EXE error install dir do not exist - Update setup.py

setup.py is looking for openerp-icon.ico in an invalid folder "install".
The correct location is
setup\windows\openerp-icon.ico

This fix build error when running setup.pe py2exe
Short description of the issue

***Impacted versions:***

 - 8.0 (master)

***Steps to reproduce:***

python setup.pe py2exe

![build-error](https://cloud.githubusercontent.com/assets/3600848/3347961/7bb906fc-f907-11e3-95dd-af4026f03613.png)



***Current behavior:***
error: Resource filename 'install\openerp-icon.ico' dose not exist

***Expected behavior:***
Find openerp-icon.ico which located in setup\windows folder