Enable test that was disabled because of JDT core bug

See eclipse-jdt/eclipse.jdt.core#2775

org.eclipse.jdt.ui.tests.refactoring/test cases/org/eclipse/jdt/ui/tests/refactoring/InlineTempTests.java

@@ -290,7 +290,6 @@ public void test30() throws Exception{
 	}
 
 	@Test
-	@Ignore("https://github.com/eclipse-jdt/eclipse.jdt.ui/issues/1552")
 	public void test31() throws Exception{
 		helper1(8, 30, 8, 30);
 	}