header: fix url

Author: swharden

layouts/_default/baseof.html

@@ -50,7 +50,7 @@
   <header class="text-light" style="background-color: #144474">
     <div class="container limit-width py-3">
       <div class="d-flex align-items-center">
-        <img src="img/favicon-transparent-darkbg.svg" width="80" height="80">
+        <img src="/patch/img/favicon-transparent-darkbg.svg" width="80" height="80">
         <div class="ms-3">
           <div class="fs-1 fw-semibold"><a href='/patch/' class="text-light">The Patch Guide</a></div>
           <div class="fs-5 fw-light">A Student's Guide to Patch-Clamp Electrophysiology</div>