KT-12138 Do not show "::error" in smart completion when any function type accepting one argument is expected

(actually made them lowest priority)

 #KT-12138 Fixed

idea/idea-completion/testData/weighers/basic/CallableReference_NothingLast.kt

@@ -0,0 +1,11 @@
+fun foo(p: (Int) -> Unit) { }
+
+fun fff1(p: Int): Nothing{}
+fun fff2(p: Int): Unit{}
+
+fun f() {
+    foo(::fff<caret>)
+}
+
+// ORDER: fff2
+// ORDER: fff1