fix: fixes elements theme mutlipart form file upload #864
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When uploading a file the Content-Type header must not be set otherwise the browser cannot set the right boundaries for the multipart formdata payload.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects
TryItOut editor in
elements
theme is currently setting the Content-Type header and therefore file uploads do not work.Should resolve #764