fix(wizard): ask for the mode after model selection

It sat second, before the project even existed. It belongs near the end, once
the pipeline is set up and the choice is about how much of the app to show.

movie_editor/frontend/onboarding.js

@@ -23,7 +23,7 @@
   // One app now — Simple and Editor are modes of it, and setup is the same either way.
   const HOST = {
     lead: "Multi-scene video on a real timeline.",
-    steps: ["theme", "uimode", "project", "prereqs", "gentype", "models", "extras", "tour", "done"],
+    steps: ["theme", "project", "prereqs", "gentype", "models", "uimode", "extras", "tour", "done"],
     extras: ["links", "shortcuts", "splits"],
     newProject: (name) => S().newProject(name),
   };