Fix showing keyboard in tablets

app/src/main/java/org/solovyev/android/calculator/EditorFragment.java

@@ -57,6 +57,12 @@ public class EditorFragment extends BaseFragment {
         return view;
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+        editorView.requestFocus();
+    }
+
     @Override
     public void onDestroyView() {
         editor.clearView(editorView);