Fixes Clicking on cross icon on create folder/create file modal throws unnessary error.

[iamnithishraja]

Fixes #2895

Changes:
Clicking on cross icon or whitespace on create folder/create file modal not dosen't throw any validation error message, instead throws only when submit button is pressed.

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #2895

[lindapaiste]

This looks good at first glance. I need to run the branch to interact with it and verify everything.

I envisioned that we would look at a submitted property on the form, but surprisingly they don't have that property. Checking for clicks on the submit button is a smart way around that.

[raclim]

Thanks for your work on this! I think this looks okay for now, so I'm going to get this in!