Switched openstreetmap favicon URL to HTTPS.

This avoids mixed content browser error/warning when YaCy is browsed
using HTTPS.

htroot/yacysearch.html

@@ -159,7 +159,7 @@ document.getElementById("Enter").innerHTML = "search again";
     ::
   <div class="searchresults">
   <h4 class="linktitle">
-  <img src="http://www.openstreetmap.org/favicon.ico" class="favicon" style="width:16px; height:16px;" alt="" />
+  <img src="https://www.openstreetmap.org/favicon.ico" class="favicon" style="width:16px; height:16px;" alt="" />
   Location -- click on map to enlarge</h4>
   <p class="url">
   #{loc}#