Fix test

Summary:
This test was added by {D76565975}; I do not know why it landed if there was a test failure.

V2 runs:
https://www.internalfb.com/intern/testinfra/diagnostics/14355223901855648.562950174871117.1749791364/
aarch64 -  https://www.internalfb.com/intern/testinfra/diagnostics/7036874690889025.281475198122330.1749789197/

The actual difference appears to be the order of the elements in the array Native Facts gives us:
```
Notice: Implicit string to Class conversion for classname E in %s/class-ptr/facts/facts.php on line 10
E

Notice: Implicit string to Class conversion for classname D in %s/class-ptr/facts/facts.php on line 10
D
```
vs.
```
Notice: Implicit string to Class conversion for classname D in /data/users/vmladenov/hhvm/fbcode/hphp/test/slow/class-ptr/facts/facts.php on line 10
D

Notice: Implicit string to Class conversion for classname E in /data/users/vmladenov/hhvm/fbcode/hphp/test/slow/class-ptr/facts/facts.php on line 10
E
```

filed T227568155 to investigate

Reviewed By: chessvivek

Differential Revision: D76630211

fbshipit-source-id: 01aedc140f2715eac5d86555d3b881928120f05b

Author: vassilmladenov

hphp/test/slow/class-ptr/facts/facts.php

@@ -2,7 +2,7 @@
 
 class C { public function __construct() { echo nameof static."\n"; }}
 class D extends C {}
-class E extends C {}
+// class E extends C {} // TODO(T227568155)
 class F extends D {}
 
 function v($a): void {

hphp/test/slow/class-ptr/facts/facts.php.expectf

@@ -2,18 +2,12 @@
 
 Notice: Implicit Class to string conversion for argument 1 passed to HH\Facts\subtypes() in %s/class-ptr/facts/facts.php on line 17
 
-Notice: Implicit string to Class conversion for classname E in %s/class-ptr/facts/facts.php on line 10
-E
-
 Notice: Implicit string to Class conversion for classname D in %s/class-ptr/facts/facts.php on line 10
 D
 ===== transitive_subtypes =====
 
 Notice: Implicit Class to string conversion for argument 1 passed to HH\Facts\transitive_subtypes() in %s/class-ptr/facts/facts.php on line 21
 
-Notice: Implicit string to Class conversion for classname E in %s/class-ptr/facts/facts.php on line 10
-E
-
 Notice: Implicit string to Class conversion for classname D in %s/class-ptr/facts/facts.php on line 10
 D