[FIR, IR] Cleanup: drop redundant enumConstructorsAreAlwaysCompatible

It's constantly true in FIR and IR (it was false in K1)

Also see: 8b9079d026

Review: https://jetbrains.team/p/kt/reviews/12750/timeline

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/actualizer/IrExpectActualMatchingContext.kt

@@ -95,9 +95,6 @@ internal abstract class IrExpectActualMatchingContext(
     override val innerClassesCapturesOuterTypeParameters: Boolean
         get() = false
 
-    override val enumConstructorsAreAlwaysCompatible: Boolean
-        get() = true
-
     override val RegularClassSymbolMarker.classId: ClassId
         get() = asIr().classIdOrFail