Fix #3493, send unauth'd /shots to /#tour

This lets a user who accesses Screenshots from the Library, but has never authenticated or used Screenshots, get redirected to an onboarding tour.

Also sends non-57 users to the normal onboarding without UITour

server/src/pages/homepage/controller.js

@@ -16,11 +16,15 @@ document.addEventListener("addon-present", () => {
   if (location.hash === "#hello") {
     document.dispatchEvent(new CustomEvent("request-onboarding"));
   } else if (location.hash === "#tour") {
-    try {
-      Mozilla.UITour.showHighlight("screenshots");
-    } catch (e) {
-      console.warn("Attempted to start #tour on non-Firefox version or unsupported version");
-      throw e;
+    if (typeof Mozilla === "undefined" || (Mozilla && Mozilla.UITour === undefined)) {
+      document.dispatchEvent(new CustomEvent("request-onboarding"));
+    } else {
+      try {
+        Mozilla.UITour.showHighlight("screenshots");
+      } catch (e) {
+        console.warn("Attempted to start #tour on non-Firefox version or unsupported version");
+        throw e;
+      }
     }
   }
 });

server/src/pages/shotindex/controller.js

@@ -33,7 +33,7 @@ exports.launch = function(m) {
     }
     let authTimeout = setTimeout(() => {
       // eslint-disable-next-line no-global-assign
-      location = location.origin;
+      location = location.origin + "/#tour";
     }, FIVE_SECONDS);
     window.wantsauth.addAuthDataListener((data) => {
       if (location.search.indexOf("reloaded") > -1) {