PanelEdit: Align chevron direction (#100386)

Adjusted the collapsable section chevron
+ point down when closed
+ point up when expanded

public/app/features/dashboard/components/PanelEditor/OptionsPaneCategory.tsx

@@ -131,7 +131,7 @@ export const OptionsPaneCategory = React.memo(
             variant="secondary"
             aria-expanded={isExpanded}
             className={styles.toggleButton}
-            icon={isExpanded ? 'angle-down' : 'angle-up'}
+            icon={isExpanded ? 'angle-up' : 'angle-down'}
             onClick={onToggle}
           />
         </div>