Smart completion: generic functions are correctly included into the list

#KT-6375 Fixed

idea/testData/completion/smart/GenericFunction5.kt

@@ -0,0 +1,13 @@
+class C<T> {
+    class object {
+        fun<T> create(t: T): C<T>{}
+    }
+}
+
+fun foo(c: C<String>){}
+
+fun f(){
+    foo(<caret>)
+}
+
+// EXIST: { lookupString: "create", itemText: "C.create", tailText: "(t: String) (<root>)", typeText: "C<String>" }