Client : when a remove an object check if the same

Signed-off-by: Jean-François Erdelyi <jean-francois.erdelyi@etu.iut-tlse3.fr>
Client : fix a bug into update test

Signed-off-by: Jean-François Erdelyi <jean-francois.erdelyi@etu.iut-tlse3.fr>
client: fix the variable name for the object center

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>