Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/jvmField/captureClassFields.kt

@@ -0,0 +1,18 @@
+// WITH_RUNTIME
+
+open class A {
+    @JvmField public val publicField = "1";
+    @JvmField internal val internalField = "2";
+    @JvmField protected val protectedField = "34";
+
+    fun test(): String {
+        return {
+            publicField + internalField + protectedField
+        }()
+    }
+}
+
+
+fun box(): String {
+    return if (A().test() == "1234") return "OK" else "fail"
+}