Fixes an incorrect display of video which would not respect its aspect ratio.

src/org/jitsi/impl/neomedia/VideoMediaStreamImpl.java

src/org/jitsi/impl/neomedia/device/MediaDeviceSession.java

...g/jitsi/impl/neomedia/device/VideoMediaDeviceSession.java

src/org/jitsi/util/event/SizeChangeVideoEvent.java

src/org/jitsi/util/event/VideoEvent.java

src/org/jitsi/util/swing/FitLayout.java