[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

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/blackbox/FirNativeCodegenBoxTestGenerated.java

@@ -27829,6 +27829,12 @@ public class FirNativeCodegenBoxTestGenerated extends AbstractNativeCodegenBoxTe
                     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 {

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/test/blackbox/FirNativeCodegenBoxTestNoPLGenerated.java

@@ -28461,6 +28461,12 @@ public class FirNativeCodegenBoxTestNoPLGenerated extends AbstractNativeCodegenB
                     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 {