Psi2ir: do not generate default accessor body for expect properties

Because generateDefaultGetterBody/generateDefaultSetterBody reference
the property's backing field, which in case of extension properties
leads to an error "Unbound symbols not allowed" because extension
property cannot have a backing field.

In some way, this check is similar to the `isExpect` check in
`generatePrimaryConstructor`.

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -24540,6 +24540,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/multiplatform/expectClassInJvmMultifileFacade.kt");
         }
 
+        @Test
+        @TestMetadata("expectProperty.kt")
+        public void testExpectProperty() throws Exception {
+            runTest("compiler/testData/codegen/box/multiplatform/expectProperty.kt");
+        }
+
         @Test
         @TestMetadata("noArgActualConstructor.kt")
         public void testNoArgActualConstructor() throws Exception {