[MPP] Permit const actual properties for non-const expects

It's safe as not having const is more restrictive, therefore can be
allowed in common. Otherwise, it's not possible to declare an expect
declaration for a platform property with `const` modifier in common

KT-18856

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/ClassicPositioningStrategies.kt

@@ -88,7 +88,9 @@ object ClassicPositioningStrategies {
                     }
                     ExpectActualCompatibility.Incompatible.FunctionModifiersDifferent,
                     ExpectActualCompatibility.Incompatible.FunctionModifiersNotSubset,
-                    ExpectActualCompatibility.Incompatible.PropertyModifiers, ExpectActualCompatibility.Incompatible.ClassModifiers -> {
+                    ExpectActualCompatibility.Incompatible.PropertyLateinitModifier,
+                    ExpectActualCompatibility.Incompatible.PropertyConstModifier,
+                    ExpectActualCompatibility.Incompatible.ClassModifiers -> {
                         element.modifierList
                     }
                     ExpectActualCompatibility.Incompatible.PropertyKind -> {