Fix Tutorial Panel height on Firefox

Firefox requires that the <div> that includes the Tutorial Panel has its
height set to 100%, otherwise it displays it with a height of 150px (per
the CSS standard).

Change-Id: Id7afd34f4aa058dd5f7b4982d6409941d472d907

appinventor/appengine/src/com/google/appinventor/client/Ode.java

@@ -1151,6 +1151,7 @@ public class Ode implements EntryPoint {
     overDeckPanel.setWidth("100%");
     overDeckPanel.add(tutorialPanel);
     overDeckPanel.setCellWidth(tutorialPanel, "0%");
+    overDeckPanel.setCellHeight(tutorialPanel, "100%");
     overDeckPanel.add(deckPanel);
     mainPanel.add(overDeckPanel, DockPanel.CENTER);
     mainPanel.setCellHeight(overDeckPanel, "100%");