Fix rapid7#5240

Author: wchen-r7

lib/msf/core/rpc/v10/rpc_db.rb

@@ -1153,6 +1153,7 @@ def rpc_del_vuln(xopts)
   def rpc_del_note(xopts)
   ::ActiveRecord::Base.connection_pool.with_connection {
     opts, wspace = init_db_opts_workspace(xopts)
+    opts[:workspace] = opts[:workspace].name
     hosts  = []
     services = []
     notes = []