[FIR] Fix inconsistent RETURN_TYPE_MISMATCH and TYPE_MISMATCH reporting on functions and properties

^KT-51203 Fixed

compiler/testData/diagnostics/tests/callableReference/unitAdaptationForReferenceCompatibility.fir.kt

@@ -21,5 +21,5 @@ fun f(): String = "test"
 
 class A {
     fun schedule1(e: Executor): Future<String> = e.submit(::f)
-    fun schedule2(e: Executor): Future<String> = <!RETURN_TYPE_MISMATCH, TYPE_MISMATCH!>e.submit { f() }<!>
+    fun schedule2(e: Executor): Future<String> = <!RETURN_TYPE_MISMATCH!>e.submit { f() }<!>
 }