NullableVsInlineThenTest: minor tweaks

* Let the two tests use different asyn visibility tokens.
* Fix up the test names - the "Only" at the end of the `testNullableReadonlyOnly` was about the fact that that test didn't have visibility declared, which is not applicable for the new tests.

Author: jrfnl

tests/Core/Tokenizers/PHP/NullableVsInlineThenTest.inc

@@ -5,11 +5,11 @@ class Nullable
     /* testNullableReadonlyOnly */
     readonly ?int $prop;
 
-    /* testNullablePrivateSetOnly */
+    /* testNullablePrivateSet */
     private(set) ?int $prop2;
 
-    /* testNullablePublicPrivateSetOnly */
-    public private(set) ?int $prop3;
+    /* testNullablePublicProtectedSet */
+    public protected(set) ?int $prop3;
 }
 
 class InlineThen

tests/Core/Tokenizers/PHP/NullableVsInlineThenTest.php

@@ -50,9 +50,9 @@ public function testNullable($testMarker)
     public static function dataNullable()
     {
         return [
-            'property declaration, readonly, no visibility' => ['/* testNullableReadonlyOnly */'],
-            'property declaration, private set'             => ['/* testNullablePrivateSetOnly */'],
-            'property declaration, public and private set'  => ['/* testNullablePublicPrivateSetOnly */'],
+            'property declaration, readonly, no visibility'  => ['/* testNullableReadonlyOnly */'],
+            'property declaration, private set'              => ['/* testNullablePrivateSet */'],
+            'property declaration, public and protected set' => ['/* testNullablePublicProtectedSet */'],
         ];
 
     }//end dataNullable()