[KT] Fix forward stack trace test after -Xsam-conversions=class flag removed.

PiperOrigin-RevId: 606245405

Author: gkdn

junit/generator/javatests/com/google/j2cl/junit/integration/stacktrace/data/KotlinLambdaStacktraceTest.stacktrace.txt

@@ -1,4 +1,4 @@
 java.lang.RuntimeException: __the_message__!
-    at com.google.j2cl.junit.integration.stacktrace.data.KotlinLambdaStacktraceTest$test$first$1.run(KotlinLambdaStacktraceTest.kt:27)
-	at com.google.j2cl.junit.integration.stacktrace.data.KotlinLambdaStacktraceTest$test$r$1.run(KotlinLambdaStacktraceTest.kt:30)
-	at com.google.j2cl.junit.integration.stacktrace.data.KotlinLambdaStacktraceTest.test(KotlinLambdaStacktraceTest.kt:31)
+  at com.google.j2cl.junit.integration.stacktrace.data.KotlinLambdaStacktraceTest.test$lambda$0(KotlinLambdaStacktraceTest.kt:27)
+  at com.google.j2cl.junit.integration.stacktrace.data.KotlinLambdaStacktraceTest.test$lambda$1(KotlinLambdaStacktraceTest.kt:30)
+  at com.google.j2cl.junit.integration.stacktrace.data.KotlinLambdaStacktraceTest.test(KotlinLambdaStacktraceTest.kt:31)