Fixing two-way binding for inputs fixes #237

[edwinwong]

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Description

Set the type attribute for the inputs non-dynamically, and changed the manually two-binding to the Svelte two-way binding using bind:value.

Fixes # 237

I've commented on the issue. This is my first pull request, please let me know how I could improve in the future, thanks!

Checklist:

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• [✓] Is this a bug fix
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