REPORT-60889 主题切换，视觉修改

designer-base/src/main/java/com/fr/design/mainframe/theme/preview/ecpreview/ECReportPreviewPane.java

@@ -49,7 +49,7 @@ public class ECReportPreviewPane extends UINoOpaquePanel implements ThemePreview
 
         public PreviewPane() {
             this.setPreferredSize(new Dimension(517, 270));
-            this.setBorder(BorderFactory.createEmptyBorder(7, 10, 5, 10));
+            this.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));
 
             this.setLayout(FRGUIPaneFactory.createBorderLayout());
             JPanel northPane = createNorthPane();