Fix minor bugs identified by 'devmode'

Change-Id: Ic50a603b585b54e16719505e05972f614888aa93

appinventor/appengine/src/com/google/appinventor/client/editor/simple/components/MockCheckBox.java

@@ -47,7 +47,7 @@ public final class MockCheckBox extends MockToggleBase<CheckBox> {
       // Get the Element from the CheckBox.
       // Call DOM.clone to make a deep clone of that element.
       // Pass that cloned element to the super constructor.
-      super(DOM.clone(ptb.getElement(), true));
+      super(DOM.clone(ptb.getElement().getFirstChildElement(), true));
     }
   }
 

appinventor/appengine/src/com/google/appinventor/client/editor/simple/components/MockSwitch.java

@@ -63,7 +63,7 @@ public final class MockSwitch extends MockToggleBase<HorizontalPanel> {
    */
   static class ClonedSwitch extends InlineHTML {
     ClonedSwitch(HorizontalPanel ptb) {
-      super(DOM.clone(ptb.getElement(), true));
+      super(DOM.clone(ptb.getWidget(0).getElement(), true));
     }
   }
 

appinventor/appengine/src/com/google/appinventor/client/widgets/properties/TextAreaPropertyEditor.java

@@ -25,7 +25,7 @@ public class TextAreaPropertyEditor extends TextPropertyEditorBase {
   public TextAreaPropertyEditor() {
    super(new TextArea());
 
-   textEdit.getElement().getStyle().setProperty("min-height", MIN_CSS_HEIGHT);
-   textEdit.getElement().getStyle().setProperty("max-width", MAX_CSS_WIDTH);
+   textEdit.getElement().getStyle().setProperty("minHeight", MIN_CSS_HEIGHT);
+   textEdit.getElement().getStyle().setProperty("maxWidth", MAX_CSS_WIDTH);
   }
 }