"Call chain may be simplified": fix false positive on Java Map

So #KT-25089 Fixed

idea/testData/inspectionsLocal/collections/simplifiableCallChain/joinToStringOnHashMap2.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+// WITH_RUNTIME
+import java.util.*
+
+class MyMap: HashMap<String, String>()
+
+fun test(data: MyMap) {
+    val result = data.<caret>map { "${it.key}: ${it.value}" }.joinToString("\n")
+}