Fix fit padding bottom zero for scene

app/src/main/java/com/hippo/ehviewer/ui/ContentActivity.java

@@ -57,11 +57,6 @@ public class ContentActivity extends StageActivity
         }
     }
 
-    @Override
-    public int getFitPaddingBottom() {
-        return 0;
-    }
-
     @Override
     public @NonNull StageLayout getStageLayout() {
         return mContentLayout;

app/src/main/java/com/hippo/scene/StageActivity.java

@@ -33,7 +33,7 @@ public abstract class StageActivity extends AbsActionBarActivity {
 
     private static SceneManager sSceneManager;
 
-    private int mFitPaddingBottom = -1;
+    private int mFitPaddingBottom;
 
     static void setSceneManager(SceneManager sceneManager) {
         sSceneManager = sceneManager;