[IrActualizer] Don't actualize expect types

This was never semantically correct, but was not important
before KT-63644, as they were immediately dropped after that anyway.

After KT-63644, they were used to compute fake overrides inside them,
which were later matched against actual class, which can
produce false-positive matching errors.

^KT-64835

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirJsCodegenBoxTestGenerated.java

@@ -24464,6 +24464,12 @@ public class FirJsCodegenBoxTestGenerated extends AbstractFirJsCodegenBoxTest {
                 runTest("compiler/testData/codegen/box/multiplatform/k2/anonymousObjectAndSpecificImplementationInDeserializedIr.kt");
             }
 
+            @Test
+            @TestMetadata("covariantOverrideInActual.kt")
+            public void testCovariantOverrideInActual() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/k2/covariantOverrideInActual.kt");
+            }
+
             @Test
             @TestMetadata("dataClassInCommonAndPlatform.kt")
             public void testDataClassInCommonAndPlatform() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirJsES6CodegenBoxTestGenerated.java

@@ -24464,6 +24464,12 @@ public class FirJsES6CodegenBoxTestGenerated extends AbstractFirJsES6CodegenBoxT
                 runTest("compiler/testData/codegen/box/multiplatform/k2/anonymousObjectAndSpecificImplementationInDeserializedIr.kt");
             }
 
+            @Test
+            @TestMetadata("covariantOverrideInActual.kt")
+            public void testCovariantOverrideInActual() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/k2/covariantOverrideInActual.kt");
+            }
+
             @Test
             @TestMetadata("dataClassInCommonAndPlatform.kt")
             public void testDataClassInCommonAndPlatform() throws Exception {