REPORT-44666 fix 无用import

designer-base/src/main/java/com/fr/design/style/background/image/ExpandFileChooser.java

@@ -5,7 +5,6 @@ import com.fr.design.DesignerEnvManager;
 import com.fr.design.gui.ibutton.UIButton;
 import com.fr.design.gui.icheckbox.UICheckBox;
 import com.fr.design.layout.FRGUIPaneFactory;
-import com.fr.design.mainframe.DesignerContext;
 import com.fr.design.utils.gui.GUICoreUtils;
 
 import com.fr.stable.StringUtils;
@@ -20,7 +19,6 @@ import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Insets;
 import java.awt.LayoutManager;
-import java.awt.Rectangle;
 import java.awt.event.ActionListener;
 
 /**