Fixed unit test display creation on my linux pc.

On my linux machine I couldn't run the StorageManagerTest test. I got the following exception durtion the display creation:

Caused by: org.lwjgl.LWJGLException: X Error - disp: 0x7f6df8a39040 serial: 28 error: BadValue (integer parameter out of range for operation) request_code: 1 minor_code: 0

Making the window 1 pixel large, fixed the issue.