Removes namespace from frame param, `tf_prefix` is deprecated as stated in 1.7.1 of the migration guide http://wiki.ros.org/tf2/Migration
Removes namespace from frame param, `tf_prefix` is deprecated as stated in
1.7.1 of the migration guide http://wiki.ros.org/tf2/Migration

/cc @andreucm

beta-robots/ensenso_nx,beta-robots/ensenso_nx