bootstrap-update: Changed hardcoded value of $SEED_MEC_HOME for $HOME

The update is expected to be executed by the same user that ran the agent.sh
(seed_mec). So, this change allows the agent to be installed in other places
instead of the predefined "/opt/seed_mec".

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>

bootstraps/bootstrap-update

@@ -27,7 +27,7 @@ FILE=
 MD5_CHECK=
 BOOTSTRAP_LINES=
 
-SEED_MEC_HOME="/opt/seed_mec"
+SEED_MEC_HOME=${HOME}
 UPDATE_DIR="update/tmp/SEED2-run"
 
 # This function shows some error message and aborts execution