OW-744: Holo app unity integration refactor

[joliveraortega]

i miss this line in your code:

[self presentViewController:[[[self unityFramework] appController] rootViewController] animated:YES completion:nil];

I had it but finally removed it. I understood it was needed to add the local view. Holo app follows either a sender or receiver approach and I considered there is no Unity integration for the sender so I could just add the local view without any Unity involvement.

with my testing adding the subview didn't work since rootViewController controls the lifecycle of GL work.