Revert "Media Base: Set player state to paused before seek"

This reverts commit 2f282b39067667c05af3fa77a2bcc572fa270eee.

The patch works for the atabake gstreamer backend, but it breaks for oms
and mplayer. Need to find a proper solution which works for all atabake
backends.

Signed-off-by: Eduardo Lima (Etrunko) <eduardo.lima@openbossa.org>

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