Build Tools: Do not delete the (now committed) `script-loader-packages.php` file when running `clean:js` and copy it to /build. Fixes cases when running `grunt watch` or `-dev` where that file may be deleted and not recreated.

See #48154.

git-svn-id: https://develop.svn.wordpress.org/trunk@47380 602fd350-edb4-49c9-b593-d223f7449a82

Gruntfile.js

@@ -113,7 +113,6 @@ module.exports = function(grunt) {
 			],
 			js: [
 				WORKING_DIR + 'wp-admin/js/',
-				WORKING_DIR + 'wp-includes/assets/',
 				WORKING_DIR + 'wp-includes/js/'
 			],
 			'webpack-assets': [
@@ -146,7 +145,6 @@ module.exports = function(grunt) {
 						expand: true,
 						cwd: SOURCE_DIR,
 						src: buildFiles.concat( [
-							'!assets/**', // Assets is extracted into separate copy tasks.
 							'!js/**', // JavaScript is extracted into separate copy tasks.
 							'!.{svn,git}', // Exclude version control folders.
 							'!wp-includes/version.php', // Exclude version.php.
@@ -356,16 +354,8 @@ module.exports = function(grunt) {
 				]
 			},
 			'webpack-assets': {
-				files: [
-					{
-						src: WORKING_DIR + 'wp-includes/js/dist/assets.php',
-						dest: SOURCE_DIR + 'wp-includes/assets/script-loader-packages.php'
-					},
-					{
-						src:  WORKING_DIR + 'wp-includes/js/dist/assets.php',
-						dest: BUILD_DIR + 'wp-includes/assets/script-loader-packages.php'
-					}
-				]
+				src: WORKING_DIR + 'wp-includes/js/dist/assets.php',
+				dest: WORKING_DIR + 'wp-includes/assets/script-loader-packages.php'
 			},
 			version: {
 				options: {