[LL FIR] do not treat content of script initializers as non-local

^KT-61260 Fixed

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/element/builder/FirElementBuilder.kt

@@ -270,7 +270,7 @@ internal fun getNonLocalContainingDeclaration(
             if (parent is KtEnumEntry ||
                 parent is KtCallableDeclaration &&
                 !notNullCandidate.isPartOf(parent) ||
-                parent is KtClassInitializer ||
+                parent is KtAnonymousInitializer ||
                 parent is KtObjectLiteralExpression ||
                 parent is KtCallElement ||
                 parent is KtCodeFragment

analysis/low-level-api-fir/testdata/nonLocalDeclarationAnchors/topLevelFor.txt

@@ -1,4 +1,4 @@
-/* anchor --> */for (/* anchor --> */(index, _)/* <-- */ in emptyList<Int>().withIndex()) {
+/* anchor --> */for ((index, _) in emptyList<Int>().withIndex()) {
 
 }
-/* <-- */
+/* <-- */