Fix test and unmute it for JVM

compiler/testData/codegen/box/casts/castToDefinitelyNotNullType.kt

@@ -1,18 +1,16 @@
 // !LANGUAGE: +DefinitelyNonNullableTypes
-// IGNORE_BACKEND: JVM
-// IGNORE_BACKEND: JVM_IR
 // IGNORE_BACKEND: JS
 // IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND: WASM
 // IGNORE_BACKEND_FIR: JVM_IR
 // FIR status: not supported in JVM
 
 fun <T> test(t: T) = t as (T & Any)
 
-fun box(): String {
+fun box(): String =
     try {
         test<Any?>(null)
+        "FAIL: expected NPE"
     } catch (ex: NullPointerException) {
-        return "FAIL: expected NPE"
-    }
-    return test("OK")
-}
+        test("OK")
+    }