fixed error with higlighted blocks

src/main/java/com/ardublock/ArduBlockTool.java

...a/com/ardublock/translator/block/control/SketchBlock.java

src/main/java/com/ardublock/ui/OpenblocksFrame.java

...com/ardublock/ui/listener/ArdublockWorkspaceListener.java

...ain/java/com/ardublock/ui/listener/NewButtonListener.java

...in/java/com/ardublock/ui/listener/OpenButtonListener.java