FIR2IR: Fix smart-cast approximation implicit receiver

Previously, it was always cast to the first type of smart cast variants list
independently of callee symbol that might be present in the member scope
of a different type

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -28666,6 +28666,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/smartCasts"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM, true);
         }
 
+        @TestMetadata("complexImplicitReceiver.kt")
+        public void testComplexImplicitReceiver() throws Exception {
+            runTest("compiler/testData/codegen/box/smartCasts/complexImplicitReceiver.kt");
+        }
+
         @TestMetadata("falseSmartCast.kt")
         public void testFalseSmartCast() throws Exception {
             runTest("compiler/testData/codegen/box/smartCasts/falseSmartCast.kt");