fix: persist onloadBehavior setting for default map feature

The default map feature was not working on page refresh because the
onloadBehavior dropdown value was not being persisted or restored.

Changes:
- main.js: Restore onloadBehavior from localStorage on page load
- save.js: saveAsDefaultMap() now saves "default" to localStorage
- save.js: clearDefaultMap() now removes the localStorage setting
- index.html: Update version hashes to 1.108.13

Now when users click "Set as default", the setting persists across
page refreshes and their default map loads automatically.

modules/io/save.js

@@ -175,6 +175,8 @@ async function saveAsDefaultMap() {
     const mapData = prepareMapData();
     const blob = new Blob([mapData], {type: "text/plain"});
     await ldb.set("defaultMap", blob);
+    localStorage.setItem("onloadBehavior", "default");
+    byId("onloadBehavior").value = "default";
     tip("Map is set as default and will open on load", true, "success", 5000);
   } catch (error) {
     ERROR && console.error(error);
@@ -186,6 +188,8 @@ async function saveAsDefaultMap() {
 async function clearDefaultMap() {
   try {
     await ldb.set("defaultMap", null);
+    localStorage.removeItem("onloadBehavior");
+    byId("onloadBehavior").value = "random";
     tip("Default map cleared", false, "success", 2000);
   } catch (error) {
     ERROR && console.error(error);