fix(ControlInput): replace root element

[Readpato]

Description

Summary

To avoid Vue complaining (rightly so) about fall-through attributes to fragments, the component now renders a <div> as a root

Closes #86

Changes

What kind of change does this PR introduce? (check at least one by adding an "x" between the brackets)

• [ ] Build-related changes
• [X] Bugfix
• [ ] Code style update
• [ ] Feature
• [ ] Refactor
• [ ] Style:
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [X] No

The PR fulfils these requirements:

• [X] TresJS code of conduct

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