Fix file input bug

[yoonieaj]

Proposed Changes

Fixes a bug with the file input dialog.

Previously, if a user loaded a file and closed the dialog, after re-opening the dialog they would still be able to load in the previously uploaded file. This pull requests fixes this behaviour so the dialog works as expected (i.e., closing the dialog also clears the uploaded file, and the user will not be able to load it in if they re-open the dialog.)

...

Screenshots of your changes (if applicable)

Type of Change

(Write an X or a brief description next to the type or types that best describe your changes.)

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)	X
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
📚 Documentation update (change that only updates documentation)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

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Before opening your pull request:

• [x] I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• [x] I have added tests for my changes, if applicable.
  • This is required for all bug fixes and new features.
• [ ] I have updated the project documentation, if applicable.
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Questions and Comments

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[coveralls]

Pull Request Test Coverage Report for Build 11247189105

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 89.893%

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Totals
Change from base Build 11170672562:	0.03%
Covered Lines:	411
Relevant Lines:	441

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💛 - Coveralls