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

#KT-5072 Fixed

idea/idea-completion/testData/handlers/basic/ExtensionFunctionTypeVariable1.kt

@@ -0,0 +1,5 @@
+fun test(i: Int, foo: Int.() -> Char) {
+    i.<caret>
+}
+
+// ELEMENT: foo

idea/idea-completion/testData/handlers/basic/ExtensionFunctionTypeVariable1.kt.after

@@ -0,0 +1,5 @@
+fun test(i: Int, foo: Int.() -> Char) {
+    i.foo()<caret>
+}
+
+// ELEMENT: foo

idea/idea-completion/testData/handlers/basic/ExtensionFunctionTypeVariable2.kt

@@ -0,0 +1,5 @@
+fun test(i: Int, foo: Int.(String) -> Char) {
+    i.<caret>
+}
+
+// ELEMENT: foo

idea/idea-completion/testData/handlers/basic/ExtensionFunctionTypeVariable2.kt.after

@@ -0,0 +1,5 @@
+fun test(i: Int, foo: Int.(String) -> Char) {
+    i.foo(<caret>)
+}
+
+// ELEMENT: foo