Fix CTextarea not working with v-model

[JackuB]

Description

I ran into a same issue as #548
Verified that their proposed fix indeed works and added a minimal test case.

Fixes #548

Related to changes in #543 - like removing the inputValue: String, prop.

Motivation and Context

Screenshots (if appropriate):

I copied and adapted test suite from CInput, and the v-model test failed before the change.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Latest commit: 7b0aede

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[codebender828]

Thank you @JackuB