batman-adv: Fix lockdep annotation of batadv_tlv_container_remove

The function handles tlv containers and not tlv handlers. Thus the
lockdep_assert_held has to check for the container_list lock.

Fixes: 2c72d655 ("batman-adv: Annotate deleting functions with external lock via lockdep")
Signed-off-by: Sven Eckelmann <sven@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>