fix pb_module name in typings

[maksimryndin]

If protofile name contains illegal characters for module name then we should wrap pb module name in single quotes in all typings

[tsloughter]

Thanks. I kinda prefer to only add the ' if it is required. And wouldn't the same be needed for {{method}}? Not sure what proto allows in the method name, but maybe can have something that must be quoted in atoms?

I think we could instead do something like converting the atoms to strings with io_lib:format("~p", [PbModule]) which will add the ' if needed and then that'll be included in the template.