Remove unnecessary copyrights

Author: joaotgouveia

tests/ub/ctor_ref_member.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 // panic-ub: refcount
 
 #include <cassert>

tests/ub/ret_ref_to_local.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 // panic-ub: refcount
 
 #include <cassert>

tests/unit/lvalue_ref_goto.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 #include <cassert>
 
 int main() {

tests/unit/ret_rvalue_ref.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 #include <cassert>
 #include <utility>
 

tests/unit/rvalue_ref_general.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 #include <cassert>
 #include <utility>
 

tests/unit/rvalue_ref_global.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 #include <cassert>
 
 int &&g = 5;

tests/unit/rvalue_ref_goto.cpp

@@ -1,6 +1,3 @@
-// Copyright (c) 2022-present INESC-ID.
-// Distributed under the MIT license that can be found in the LICENSE file.
-
 #include <cassert>
 
 int main() {