B #3597: Fix send credentials noVNC

[tryfunc]

Fixed sending noVNC credentials with password enabled.

[tryfunc]

@jloboescalona2 Why make a separate PR for the same changes? PR #3651

In addition, to add additional parameters in the future, it would be more logical to do otherwise:

var rfbConfig = password? { "credentials": { "password": password } } : {};

var rfbConfig = { "credentials": { "password": password || null } };

credentials - An Object specifying the credentials to provide to the server when authenticating. The following credentials are possible:

name	type	description
"username"	DOMString	The user that authenticates
"password"	DOMString	Password for the user
"target"	DOMString	Target machine or session

[jloboescalona2]

hi, @tryfunc. Sorry for the inconvenience, but in your PR not valid, the case that does not send password, in that case the RFB configuration should remain the same call to NoVNV, thanks for your contribution