JVM_IR: omit bound receiver in IrExpressionLambdaImpl parameters

and remove a hack intended to replace the missing type conversions this
caused.

 #KT-46505 Fixed

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

@@ -19000,6 +19000,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                     runTest("compiler/testData/codegen/box/inlineClasses/callableReferences/let/intN.kt");
                 }
 
+                @Test
+                @TestMetadata("null.kt")
+                public void testNull() throws Exception {
+                    runTest("compiler/testData/codegen/box/inlineClasses/callableReferences/let/null.kt");
+                }
+
                 @Test
                 @TestMetadata("result.kt")
                 public void testResult() throws Exception {