Remove any previous failed hubzilla install

src/freedombone-app-hubzilla

     function_check install_mariadb
     install_mariadb
 
+    if [ -d /var/www/$HUBZILLA_DOMAIN_NAME ]; then
+        rm -rf /var/www/$HUBZILLA_DOMAIN_NAME
+        drop_database hubzilla
+    fi
+
     function_check get_mariadb_password
     get_mariadb_password