K2 Scripting: fix locality of script declarations

the script declarations are considered public, at least because they
can be reused from another script then used with the `importedScripts`
configuration property. It also improves the compatibility with K1
scripting.

compiler/psi/src/org/jetbrains/kotlin/psi/KtNamedFunction.java

@@ -247,7 +247,7 @@ public class KtNamedFunction extends KtTypeParameterListOwnerStub<KotlinFunction
     @Override
     public boolean isLocal() {
         PsiElement parent = getParent();
-        return !(parent instanceof KtFile || parent instanceof KtClassBody);
+        return !(parent instanceof KtFile || parent instanceof KtClassBody || parent.getParent() instanceof KtScript);
     }
 
     public boolean isAnonymous() {