Remove unused this._ws check from _initWsCallbacks

[lucasrmendonca]

Description, Motivation and Context

This code is never reached since function connect() already checks for this._ws before safely calling _initWsCallbacks();
Also, in case there was no this._ws I'd prefer a runtime error over silently failing and returning with no error message

What kind of change does this PR introduce?

• Refactoring (no new functionality, only code improvements)

Checklist:

• My code follows the code style of this project.
• I have added tests to cover my changes.
• Overall test coverage is not decreased.
• All new and existing tests passed.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[coveralls]

Coverage: 98.056% (-0.002%) from 98.057% when pulling 21f89f6 on lucasrmendonca:removeUnnecessaryCheckFromInitWsCallbacks into 7c92a2d on KSDaemon:dev.

[KSDaemon]

Yeah, agree 👍🏻