Correct mirror mistake for RealSense and PrimeSense

[tansangxtt]

These are mirror errors however we will get stuck when enable them to build. This fixing is to make building fine

[carstenschwede]

@tansangxtt RealSenseSensor.cpp/.h are missing, though?

[Szamo]

Yes, RealSenseSensor.cpp/.h are missing. However the modification has sense, it makes the code more uniform. It adds getSensorName to PrimeSenseSensor.h, and adds a RealSenseSensor object creator line to FriedLiver.cpp. You can say the RealSenseSensor files are missing, but the original code also fails in that case. These modifications are only fixes. Unfortunately I do not know where you can get RealSenseSensor files.