add component.start() to both list and detail (framework calls instance.start)

plugin.js

@@ -50,6 +50,12 @@
             return comp.render();
         };
 
+        // Framework (ActivitySlide.start) calls component.start() after the
+        // activity is ready. Refresh the selector so focus lands on a card.
+        this.start = function () {
+            if (Lampa.Selector) Lampa.Selector.update();
+        };
+
         this.render = function () {
             var html = document.createElement('div');
             html.className = 'mymovies';
@@ -131,6 +137,11 @@
             return comp.render();
         };
 
+        // Framework (ActivitySlide.start) calls component.start().
+        this.start = function () {
+            if (Lampa.Selector) Lampa.Selector.update();
+        };
+
         this.render = function () {
             var m = selected;
             if (!m) { Lampa.Activity.back(); return document.createElement('div'); }