plugins: encode: fix a deadlock because of _drain()

plugins: encode: fix a deadlock because of _drain()

We call gst_vaapiencode_drain() in gst_vaapiencode_change_state(),
whose context does not hold the stream lock of the encoder. The
current gst_vaapiencode_drain inside unlock/lock pair adds a extra
lock count to the stream lock of encoder and causes hang later.
We just remove the gst_vaapiencode_drain() and expand its logic
correctly according to the lock/unlock context.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/433>