Drag and Drop Import option allows folders with space in name

By using the drag and drop import feature, users can import files that contain spaces in the name. This causes an error in the editor where files inside it cannot save because of the name. Renaming the folder once it is imported resolves this issue.

Tested In:
4.15.3 - CL 3450819
4.16.2 - CL 3466753
4.17 - CL 3515847

1. Create a new project (no template or starter content needed)
2. Drag and Dop the folder provided into the content browser
3. attempt to save the file
   Result: The editor will not save the file due to an error
   Expected Result; The Editor would not allow the folder to import

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