JVM: update test data after enabling IR fake override builder

#KT-61514 Fixed

compiler/testData/ir/irText/firProblems/SignatureClash.kt

@@ -1,6 +1,4 @@
 // FIR_IDENTICAL
-// KT-64271
-// IGNORE_BACKEND_K2: JVM_IR
 
 typealias Some = (Any) -> String?
 
@@ -23,4 +21,4 @@ interface Delegate : Base {
 
 interface Derived : Delegate
 
-data class DataClass(val delegate: Delegate): Derived, Delegate by delegate
+data class DataClass(val delegate: Delegate): Derived, Delegate by delegate