Report error instead of warning for deprecation level HIDDEN

Since functions usually are hidden from resolution when they are
deprecated-hidden, the problem can only be reproduced for properties with
deprecated-hidden accessors, where DeprecatedCallChecker reported warnings
instead of errors

compiler/testData/diagnostics/tests/deprecated/deprecatedPropertyInheritance.kt

@@ -131,5 +131,5 @@ fun use(
     ned.p = 1
 
     diff.<!DEPRECATION!>p<!>
-    diff.<!DEPRECATION, DEPRECATION!>p<!> = 1
+    diff.<!DEPRECATION, DEPRECATION_ERROR!>p<!> = 1
 }