Demote new experimental capitalize overloads in overload resolution

Revert "Fix method reference ambiguity in test after introducing 'capitalize' overload"
This reverts commit fe9bd9ee

compiler/testData/codegen/box/reflection/functions/functionFromStdlib.kt

@@ -7,6 +7,5 @@ import kotlin.reflect.jvm.isAccessible
 fun doStuff(fn: KFunction1<String, String>) = fn.call("oK")
 
 fun box(): String {
-    val method: KFunction1<String, String> = String::capitalize
-    return doStuff(method.apply { isAccessible = true })
+    return doStuff(String::capitalize.apply { isAccessible = true })
 }