Retina fix, extra setWindowShape is not required

[speps]

In ofAppGLFWWindow.cpp line 243, setWindowShape is not required, the window already has the right size.

Removing the line fixed it for me.

Tested on master branch, OS X 10.10.5, MacBook Pro Retina mid 2014.

I use the old trick I found on the forums to get Retina to work though, which is adding this line in the setup :

ofSetWindowShape(ofGetWidth(), ofGetHeight());

That doesn't have any effect without Retina so it doesn't matter. In the end, I don't know why Retina wouldn't work properly without the line.

[bilderbuchi]

ping @openframeworks/macos

[speps]

Note that this is working (the trick in setup) in 0.8.4. However, when I decided to use master, I noticed it didn't work anymore because ofMatrixStack does a glfwGetWindowSize before the setup is done.