REPORT-55108 【组件背景分离】组件复用-边框选择自定义图片，但还没具体选择某张图片时，此时的点九图填充设置按钮应该先灰化

【问题原因】
原交互稿上没有灰化的逻辑，补充下
【改动思路】
【review建议】

designer-form/src/main/java/com/fr/design/gui/xpane/BorderLineAndImagePane.java

@@ -219,6 +219,7 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
                 }
                 if (!borderLineCombo.isSelectedBorderImage()) {
                     imagePreviewPane.setImageWithSuffix(null);
+                    tweakNinePointButton.setEnabled(false);
                 }
 
                 fireStateChanged();
@@ -244,6 +245,9 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
                         ninePointLeft = ninePointRight = (image != null ? image.getWidth(null) / 3 : -1);
                         ninePointTop = ninePointBottom = (image != null ? image.getHeight(null) / 3 : -1);
                         borderImageOpacityPane.populateBean(1.0);
+                        if (image != null) {
+                            tweakNinePointButton.setEnabled(true);
+                        }
 
                         fireStateChanged();
                     }
@@ -285,6 +289,7 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
             if (image != null) {
                 this.borderLineCombo.selectBorderImage();
                 this.imagePreviewPane.setImageWithSuffix(((ImageBackground) borderImage).getImageWithSuffix());
+                this.tweakNinePointButton.setEnabled(true);
                 this.borderImageOpacityPane.populateBean(style.getBorderImageOpacity());
                 if (ninePoint != null && ninePoint.length == 4 && ninePoint[0] > 0 && ninePoint[1] > 0 && ninePoint[2] > 0 && ninePoint[3] > 0) {
                     ninePointLeft   = ninePoint[0];