Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/fullJdk/kt434.kt

@@ -0,0 +1,15 @@
+// FULL_JDK
+
+import java.net.*
+
+fun String.decodeURI(encoding : String) : String? =
+    try {
+        URLDecoder.decode(this, encoding)
+    }
+    catch (e : Throwable) {
+        null
+    }
+
+fun box() : String {
+    return if("hhh".decodeURI("") == null) "OK" else "fail"
+}