Minor, fix builtinFunctionReferenceOwner.kt for android-tests

In codegen tests on Android, everything is being run with kotlin-reflect
in the classpath. So a package is no longer represented by a
reflect-less PackageReference, but by a full-blown KPackageImpl. Use a
less specific supertype ClassBasedDeclarationContainer instead, the one
which is a supertype of both PackageReference and KPackageImpl, and
which still allows to get the underlying jClass.

compiler/testData/codegen/box/callableReference/builtinFunctionReferenceOwner.kt

@@ -5,7 +5,7 @@
 fun box(): String {
     val f = Any?::toString
 
-    val owner = (f as kotlin.jvm.internal.CallableReference).owner as kotlin.jvm.internal.PackageReference
+    val owner = (f as kotlin.jvm.internal.CallableReference).owner as kotlin.jvm.internal.ClassBasedDeclarationContainer
     if (owner.jClass.name != "kotlin.jvm.internal.Intrinsics\$Kotlin") return "Fail: $owner"
 
     return "OK"