delete ynh_package_update duplicate

scripts/upgrade

@@ -162,7 +162,6 @@ then
 	    DEBIAN_FRONTEND=noninteractive apt-mark unhold zabbix-server-mysql zabbix-frontend-php
 
         ynh_print_info "Update zabbix via apt package"
-        ynh_package_update
         ynh_install_app_dependencies libapr1 libaprutil1 libaprutil1-dbd-sqlite3 libaprutil1-ldap liblua5.2-0 php7.0 php-bcmath php7.0-bcmath ttf-dejavu-core php7.0-bcmath patch smistrip unzip wget fping libcap2-bin libiksemel3 libopenipmi0 libpam-cap libsnmp-base libsnmp30 snmptrapd snmpd libjs-prototype jq zabbix-server-mysql zabbix-agent zabbix-frontend-php
 	    
 	    rm /usr/share/zabbix/conf/zabbix.conf.php