[Enact Browser] Update copyright year

:Release Notes:
Update copyright year about modified file since 2020

:Detailed Notes:
Update copyright year about modified file since 2020

:Testing Performed:
Only build tested

:QA Notes:

:Issues Addressed:
[PLAT-106310] Clean up codes for Enact browser

Change-Id: I0a04930368aee03c662b92792d42c168462a1cd5

Author: jeongran1230

samples/enact-based/src/views/BookmarkManager/BookmarkManager.js

@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 LG Electronics, Inc.
+// Copyright (c) 2018-2020 LG Electronics, Inc.
 // SPDX-License-Identifier: LicenseRef-EnactBrowser-Evaluation
 //
 // You may not use this content except in compliance with the License.

samples/enact-based/src/views/ContentView/ContentItem.js

@@ -1,4 +1,4 @@
-// Copyright (c) 2019 LG Electronics, Inc.
+// Copyright (c) 2019-2020 LG Electronics, Inc.
 // SPDX-License-Identifier: LicenseRef-EnactBrowser-Evaluation
 //
 // You may not use this content except in compliance with the License.

samples/enact-based/src/views/History/History.js

@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 LG Electronics, Inc.
+// Copyright (c) 2018-2020 LG Electronics, Inc.
 // SPDX-License-Identifier: LicenseRef-EnactBrowser-Evaluation
 //
 // You may not use this content except in compliance with the License.

samples/enact-based/src/views/Settings/Settings.js

@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 LG Electronics, Inc.
+// Copyright (c) 2018-2020 LG Electronics, Inc.
 // SPDX-License-Identifier: LicenseRef-EnactBrowser-Evaluation
 //
 // You may not use this content except in compliance with the License.

samples/enact-based/src/views/WebView/WebView.js

@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 LG Electronics, Inc.
+// Copyright (c) 2018-2020 LG Electronics, Inc.
 // SPDX-License-Identifier: LicenseRef-EnactBrowser-Evaluation
 //
 // You may not use this content except in compliance with the License.