KT-6780 Completion inserts incorrect comma in end of parameter list when lambda parameter exists

#KT-6780 Fixed

idea/idea-completion/testData/handlers/smart/LastNonOptionalParamIsFunction.kt

@@ -0,0 +1,7 @@
+fun foo(p: Int, handler: () -> Unit, optional: String = ""){}
+
+fun bar(p: Int) {
+    foo(<caret>)
+}
+
+// ELEMENT: p