pkg/adt: remove TODO

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

pkg/adt/interval_tree_test.go

@@ -280,24 +280,6 @@ func TestIntervalTreeDelete(t *testing.T) {
 	}
 	visitsAfterDelete11 := tr.visitLevel()
 	if !reflect.DeepEqual(expectedAfterDelete11, visitsAfterDelete11) {
-		// "black-height" property is violated here
-		//
-		// TODO: fix this
-		//                        [510,511]
-		//                         /      \
-		//               ----------        --------------------------
-		//              /                                            \
-		//          [82,83]                                       [830,831]
-		//                \                                      /          \
-		//                 \                                    /            \
-		//              [383,384]                        [647,648]           [899,900]
-		//              /       \                              \                 /    \
-		//             /         \                              \               /      \
-		//       [261,262]      [410,411]                      [815,816] [888,889]    [972,973]
-		//         /   \                                                                /
-		//        /     \                                                              /
-		// [238,239]   [292,293]                                                [953,954]
-		//
 		t.Fatalf("level order after deleting '11' expected %v, got %v", expectedAfterDelete11, visitsAfterDelete11)
 	}
 }