KT-5072 Values of extension function type are not seen in completion

#KT-5072 Fixed

idea/idea-completion/testData/smart/ExtensionFunctionTypeVariables.kt

@@ -0,0 +1,7 @@
+fun test(i: Int, foo1: Int.(String) -> Char, foo2: Int.() -> Int, foo3: String.() -> Char): Char {
+    return i.<caret>
+}
+
+// EXIST: { lookupString: "foo1", itemText: "foo1", tailText: "(String)", typeText: "Char", attributes: "bold" }
+// ABSENT: foo2
+// ABSENT: foo3