Remove extra check that the system dll exists (#10244)

.github/CODEOWNERS

@@ -11,6 +11,7 @@
 
 # Area: Security
 # @TravisEz13 @PaulHigin
+src/System.Management.Automation/security/wldpNativeMethods.cs @TravisEz13 @PaulHigin
 
 # Area: Documentation
 .github/    @joeyaiello @TravisEz13

src/System.Management.Automation/security/wldpNativeMethods.cs

@@ -113,9 +113,8 @@ namespace System.Management.Automation.Security
         private static SystemEnforcementMode GetWldpPolicy(string path, SafeHandle handle)
         {
             // If the WLDP assembly is missing (such as windows 7 or down OS), return default/None to skip WLDP validation
-            if (s_hadMissingWldpAssembly || !IO.File.Exists(IO.Path.Combine(Environment.SystemDirectory, "wldp.dll")))
+            if (s_hadMissingWldpAssembly)
             {
-                s_hadMissingWldpAssembly = true;
                 return s_cachedWldpSystemPolicy.GetValueOrDefault(SystemEnforcementMode.None);
             }