Adapt new JSCodeGen change to new scheme

Author: odersky

compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala

@@ -447,7 +447,7 @@ class JSCodeGen()(implicit ctx: Context) {
         "genClassFields called with a ClassDef other than the current one")
 
     // Term members that are neither methods nor modules are fields
-    classSym.info.decls.filter(f => !f.is(Method | Module) && f.isTerm).map({ f =>
+    classSym.info.decls.filter(f => !f.isOneOf(Method | Module) && f.isTerm).map({ f =>
       implicit val pos = f.span
 
       val name =