Fix rotate segfault in HostWindow

Sets metaDataKey to always be 0 because call to
m_data->metaDataBuffer()->key() segfaults.

Open-webOS-DCO-1.0-Signed-off-by: Kimmo Leppala <kimmo.leppala@palm.com>

Change-Id: I58452ef52960f5899e0d4f355e1b456814b6fad7