UAST test data fixes: @null in render

as a "nullability" annotation for primitive types

plugins/uast-kotlin/testData/SimpleScript.render.txt

@@ -1,19 +1,19 @@
 public class SimpleScript : kotlin.script.templates.standard.ScriptTemplateWithArgs {
-    public final fun getBarOrNull(flag: boolean) : SimpleScript.Bar {
+    public final fun getBarOrNull(@null flag: boolean) : SimpleScript.Bar {
         return if (flag) <init>(42) else null
     }
-    public fun SimpleScript(p: java.lang.String[]) {
+    public fun SimpleScript(@null p: java.lang.String[]) {
         println("Hello World!")
         getBarOrNull(true)
         println("Goodbye World!")
     }
     public static final class Bar {
-        private final var b: int = 0
-        private final var a: int
+        @null private final var b: int = 0
+        @null private final var a: int
         public final fun getB() : int = UastEmptyExpression
         public final fun getAPlusB() : int = a + b
         public final fun getA() : int = UastEmptyExpression
-        public fun Bar(a: int) = UastEmptyExpression
+        public fun Bar(@null a: int) = UastEmptyExpression
         public static final class Baz {
             public final fun doSomething() : void {
             }