Open up system/ee/EllisLab/Addons/filepicker/views/UploadView.php
and look at line 12:
<link rel="stylesheet" href="<?=ee('CP/URL', 'css/cp_global_ext', array('theme' => ee()->cp->cp_theme))?>" type="text/css" />
And replace that with this:
<link rel="stylesheet" href="<?=ee('CP/URL', 'css/cp_global_ext')?>" type="text/css" />
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