Build: Fix the regex removing the ESLint comment from wrapper.js

The new regex from after the switch from JSHint to ESLint wasn't catching
the ESLint pragma correctly.

Also, the spacing of the pragma comment was updated to match other comments.

build/tasks/build.js

@@ -38,7 +38,7 @@ module.exports = function( grunt ) {
 			// Avoid breaking semicolons inserted by r.js
 			skipSemiColonInsertion: true,
 			wrap: {
-				start: wrapper[ 0 ].replace( /\/\*eslint .* \*\/\n/, "" ),
+				start: wrapper[ 0 ].replace( /\/\*\s*eslint(?: |-).*\s*\*\/\n/, "" ),
 				end: globals.replace(
 					/\/\*\s*ExcludeStart\s*\*\/[\w\W]*?\/\*\s*ExcludeEnd\s*\*\//ig,
 					""

src/wrapper.js

@@ -1,4 +1,4 @@
-/*eslint-disable no-unused-vars*/
+/* eslint-disable no-unused-vars*/
 /*!
  * jQuery JavaScript Library v@VERSION
  * https://jquery.com/