flamingo: Pin to commit that does not break HTML-pages

Commit
https://github.com/pengutronix/flamingo/commit/0a498b95d2f8fcb5920cc0e5e9d5637e47704346
changes the HTML parsing behavior of flamingo.
Images are now handled by the core.
Thus the images are not taken from the /static folder.

This change pins flamingo to the commit prior to the above.
We should fix freifunk-bs.de (some time later)...

Signed-off-by: Chris Fiege <chris@tinyhost.de>
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