have STLLoader pass on withCredentials to internal FileLoader

examples/js/loaders/STLLoader.js

@@ -69,12 +69,7 @@ THREE.STLLoader.prototype = Object.assign( Object.create( THREE.Loader.prototype
 		loader.setPath( scope.path );
 		loader.setResponseType( 'arraybuffer' );
 		loader.setRequestHeader( this.requestHeader );
-
-		if ( scope.crossOrigin === 'use-credentials' ) {
-
-			loader.setWithCredentials( true );
-
-		}
+		loader.setWithCredentials( scope.withCredentials );
 
 		loader.load( url, function ( text ) {
 

examples/jsm/loaders/STLLoader.js

@@ -77,12 +77,7 @@ STLLoader.prototype = Object.assign( Object.create( Loader.prototype ), {
 		loader.setPath( scope.path );
 		loader.setResponseType( 'arraybuffer' );
 		loader.setRequestHeader( this.requestHeader );
-
-		if ( scope.crossOrigin === 'use-credentials' ) {
-
-			loader.setWithCredentials( true );
-
-		}
+		loader.setWithCredentials( scope.withCredentials );
 
 		loader.load( url, function ( text ) {