Everywhere: Add missing comma between copyright year and name

Kernel/TTY/VirtualConsole.cpp

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * Copyright (c) 2020 Sergey Bugaev <bugaevc@serenityos.org>
+ * Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */

Userland/Applications/Calculator/CalculatorWidget.cpp

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
- * Copyright (c) 2021 Glenford Williams <gw_dev@outlook.com>
+ * Copyright (c) 2021, Glenford Williams <gw_dev@outlook.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */

Userland/Applications/Calculator/CalculatorWidget.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
- * Copyright (c) 2021 Glenford Williams <gw_dev@outlook.com>
+ * Copyright (c) 2021, Glenford Williams <gw_dev@outlook.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */

Userland/Libraries/LibGfx/ClassicStylePainter.cpp

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * Copyright (c) 2020 Sarah Taube <metalflakecobaltpaint@gmail.com>
+ * Copyright (c) 2020, Sarah Taube <metalflakecobaltpaint@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */

Userland/Libraries/LibGfx/ClassicStylePainter.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * Copyright (c) 2020 Sarah Taube <metalflakecobaltpaint@gmail.com>
+ * Copyright (c) 2020, Sarah Taube <metalflakecobaltpaint@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */