Modal width not reacting to resizing of browser window

[Philipp Memmel]

Steps to reproduce:

• Open a modal resource (PDF for example) in non-editing mode in a pretty narrow browser window
• Close modal
• Resize browser window to full max width
• Open resource again: See bug: Modal still has the (very narrow) width from before

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[Philipp Memmel]

See https://bitbucket.org/dw8/moodle-format_tiles/pull-requests/6