Fix type of member references without explicit class on LHS

Type of '::foo' for a function foo in a class A should be KFunction0<Unit>, not
KFunction1<A, Unit>. Continue to report an error in this case, to be maybe
supported in the future

compiler/testData/diagnostics/tests/callableReference/function/noAmbiguityMemberVsTopLevel.txt

@@ -1,5 +1,7 @@
 package
 
+public fun explicitlyExpectFunction0(/*0*/ f: () -> kotlin.Unit): () -> kotlin.Unit
+public fun explicitlyExpectFunction1(/*0*/ f: (A) -> kotlin.Unit): (A) -> kotlin.Unit
 public fun foo(): kotlin.Unit
 
 public final class A {