Specify JVM target backend for test with java type inheritance

compiler/testData/codegen/box/classes/kt1134.kt

@@ -1,6 +1,5 @@
-// IGNORE_BACKEND: JS_IR
 // TODO: Enable when JS backend supports Java class library
-// IGNORE_BACKEND: JS, NATIVE
+// TARGET_BACKEND: JVM
 public class SomeClass() : java.lang.Object() {
 }
 

compiler/testData/codegen/box/classes/kt2288.kt

@@ -1,6 +1,5 @@
-// IGNORE_BACKEND: JS_IR
 // TODO: Enable when JS backend supports Java class library
-// IGNORE_BACKEND: JS, NATIVE
+// TARGET_BACKEND: JVM
 public open class Test(): java.util.RandomAccess, Cloneable, java.io.Serializable
 {
         public override fun clone(): Test = Test() // Override 'clone()' with more precise type 'Test'