html/template.html: fix location hash redirect

When no hash is present, `locationHashChanged` will
add an extra `#` symbol at the end of the URL. This
is problematic as it adds another entry in the
browser history, making it impossible to go back to
previous page using the browser 'back button'.

Author: erdnaxe

src/html/template.html

@@ -251,7 +251,9 @@ <h4>
     if(field && document.getElementById(`${peripheral}-${register}-fields`)) {
       document.getElementById(`${peripheral}-${register}-fields`).open = true
     }
-    window.location.hash = window.location.hash
+    if (window.location.hash) {
+      window.location.hash = window.location.hash
+    }
   }
   window.addEventListener("hashchange", locationHashChanged)
   locationHashChanged()