K2: add ACCIDENTAL_OVERRIDE_CLASH_BY_JVM_SIGNATURE for clashing functions

This diagnostic is reported on an explicitly-declared function which
overrides a regular Java function with the same signature as a hidden
one from the same scope.

#KT-64846 Fixed

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassUseSiteMemberScope.kt

@@ -565,7 +565,7 @@ class JavaClassUseSiteMemberScope(
                 symbol = newSymbol
                 dispatchReceiverType = klass.defaultType()
             }.apply {
-                initialSignatureAttr = original
+                initialSignatureAttr = explicitlyDeclaredFunctionWithErasedValueParameters.fir
                 isHiddenToOvercomeSignatureClash = true
             }
             // Collect synthetic function which is a hidden copy of declared one with unerased parameters