generated code incorrectly refers to $util instead of util

[tamird]

In CockroachDB we have some protos in the util package, but the protobufjs generated code trips on this and generates code like this:

            UnresolvedAddr.decode = function decode(reader, length) {
                if (!(reader instanceof $Reader))
                    reader = $Reader.create(reader);
                let end = length === undefined ? reader.len : reader.pos + length, message = new $root.cockroach.$util.UnresolvedAddr();
                while (reader.pos < end) {
                    let tag = reader.uint32();
                    switch (tag >>> 3) {
                    case 1:
                        message.network_field = reader.string();
                        break;
                    case 2:
                        message.address_field = reader.string();
                        break;
                    default:
                        reader.skipType(tag & 7);
                        break;
                    }
                }
                return message;
            };

Note that $root.cockroach.$util should be $root.cockroach.util.

[dcodeIO]

Got a bit lost in espree's AST so please let me know if this fixes your issue(s). Might affect the PR.

[tamird]

Fixes my issue, hurray! Rebased the PR as well.