Ajax: remove use of jQuery#each second argument

(cherry-picked from a4715f4216ace92fba6991106053415e66289686)
Ref gh-2090

src/ajax/load.js

@@ -70,7 +70,9 @@ jQuery.fn.load = function( url, params, callback ) {
 		// but they are ignored because response was set above.
 		// If it fails, this function gets "jqXHR", "status", "error"
 		}).always( callback && function( jqXHR, status ) {
-			self.each( callback, response || [ jqXHR.responseText, status, jqXHR ] );
+			self.each( function() {
+				callback.apply( self, response || [ jqXHR.responseText, status, jqXHR ] );
+			});
 		});
 	}