JVM IR: do not generate extension receiver parameter as ACC_MANDATED

Otherwise Java reflection is not able to load its type as a
parameterized type.

 #KT-40857 Fixed

compiler/testData/codegen/box/parametersMetadata/kt40857_parameterizedExtensionReceiver.kt

@@ -0,0 +1,17 @@
+// SKIP_JDK6
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND: JVM
+// WITH_STDLIB
+// FULL_JDK
+// PARAMETERS_METADATA
+
+import java.lang.reflect.ParameterizedType
+
+fun List<String>.bar(i: Int) = Unit
+
+fun box(): String {
+    val function = object {}.javaClass.enclosingClass.getDeclaredMethods().single { it.name == "bar" }
+    val type = function.parameters[0].parameterizedType
+    if (type !is ParameterizedType || type.toString() != "java.util.List<java.lang.String>") return "Fail: $type ${type.javaClass}"
+    return "OK"
+}