Update therapy-system.html

wiki/pages/therapy-system.html

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       <p style="text-align: center; font-size: 0.9em; margin-top: 10px;">fig 11 Changes in lactic acid secretion with different carbon source combinations in short-term culture.</p>
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-      <img src="https://static.igem.wiki/teams/5187/wiki-therapysystem-fig/fig11.jpg" alt="ibd_figure" class="shadowed-image" style="width: 45%; max-width: 400px;">
+      <img src="https://static.igem.wiki/teams/5187/wiki-therapysystem-fig/fig11.png" alt="ibd_figure" class="shadowed-image" style="width: 45%; max-width: 400px;">
       <p style="text-align: center; font-size: 0.9em; margin-top: 10px;">fig 12 Changes in lactic acid secretion with different carbon source combinations in long-term culture.</p>
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