Prevent the file from being uploaded if the mimeType is invalid

[predaytor]

Сurrently, regardless of the configuration, the data is loaded to the disk, even after displaying an invalid mimeType error.

upload: {
    staticURL: '/uploads',

    staticDir: path.resolve(__dirname, '../../uploads'),

    mimeTypes: ['image/*'],
}

[denolfe]

Thank you for the report @predaytor . I was able to recreate this - moving to an issue. #940