[co19] Remove Compiler-tear-offs tests from status files.

Change-Id: Ia41537d3a4c5951841de92507c62711d1f2d8fd5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/202240
Reviewed-by: Erik Ernst <eernst@google.com>
Commit-Queue: Erik Ernst <eernst@google.com>

Author: iarkh

tests/co19/co19-co19.status

@@ -2,7 +2,6 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-LanguageFeatures/Constructor-tear-offs: Skip # not implemented
 LibTest/io/RawDatagramSocket/*: Skip # https://github.com/dart-lang/co19/issues/195
 
 [ $compiler == dart2analyzer ]