Fix test in response to SWT change in CTabFolder

getSimple is now a no-opt

eclipse-platform/eclipse.platform.swt#3168

Author: vogella

tests/org.eclipse.e4.ui.tests.css.swt/src/org/eclipse/e4/ui/tests/css/swt/CTabFolderTest.java

@@ -185,8 +185,9 @@ void testSimple() {
 		assertEquals("true", engine.retrieveCSSProperty(folderToTest, "swt-simple", null));
 		folderToTest.getShell().close();
 		folderToTest = createTestCTabFolder("CTabFolder { swt-simple: false}");
-		assertEquals(false, folderToTest.getSimple());
-		assertEquals("false", engine.retrieveCSSProperty(folderToTest, "swt-simple", null));
+		// Curved tabs are no longer supported, so getSimple() always returns true
+		assertEquals(true, folderToTest.getSimple());
+		assertEquals("true", engine.retrieveCSSProperty(folderToTest, "swt-simple", null));
 	}
 
 	@Test