Remove a test that was a regression test for the C extension

tests/Fixtures/regression/issue_1143.test

@@ -1,23 +0,0 @@
---TEST--
-error in twig extension
---TEMPLATE--
-{{ object.region is not null ? object.regionChoices[object.region] }}
---DATA--
-class House
-{
-    const REGION_S = 1;
-    const REGION_P = 2;
-
-    public static $regionChoices = [self::REGION_S => 'house.region.s', self::REGION_P => 'house.region.p'];
-
-    public function getRegionChoices()
-    {
-        return self::$regionChoices;
-    }
-}
-
-$object = new House();
-$object->region = 1;
-return ['object' => $object]
---EXPECT--
-house.region.s