Remove warning message for already registered custom element

[marcoroth]

Type of PR

"Bug fix"

Description

In #124 I introduced a warning message that would warn a developer if the custom element stream-from was already registered. It turns out that we can't check it that easily with our setup - especially if you are using CableReady via a different package in your app.

Long story short: This PR removes that check since it always showed the warning message, even if everything was fine.

Why should this be added

To avoid confusion about the already registered custom element.

Checklist

• My code follows the style guidelines of this project
• Checks (StandardRB & Prettier-Standard) are passing
• This is not a documentation update