[import VCF] Cancel button disabled

[antonylebechec]

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Describe the bug Cancel button disabled in import VCF

To Reproduce Steps to reproduce the behavior, for example:

1. Click on 'Import file'
2. Click on 'Cancel'
3. Dialog box not closed

Expected behavior Dialog box closed.

Screenshots

Desktop (please complete the following information):

• OS: MacOS
• Version of Cutevariant: devel