Test: Clean up custom init tasks after tests have run

core/src/test/java/com/github/weisj/darklaf/core/test/CustomTitleBarTest.java

@@ -40,6 +40,7 @@ import javax.swing.JRootPane;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 
+import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.BeforeEach;
@@ -75,6 +76,11 @@ class CustomTitleBarTest extends AbstractImageTest implements NonThreadSafeTest
         }));
     }
 
+    @AfterAll
+    static void tearDown() {
+        TestUtils.runOnSwingThreadNotThrowing(() -> LafManager.getUserInitTasks().clear());
+    }
+
     @BeforeEach
     void beforeEach() {
         LafManager.setDecorationsEnabled(true);