fix(VaFormField): fix not working errorCount prop

[padinko]

Description

Property errorCount is not working in <VaFormField>. It always shows only 1 error message.

Markup:

<VaFormField
    dirty
    error
    :error-count="2"
    :error-messages="['error 1', 'error 2']"
>
    example field
</VaFormField>

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 not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

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