fix: properly respect AllowRepeatedMorphs (#39411)

* fix: properly respect AllowRepeatedMorphs

* feat: add IgnoreAllowRepeatedMorphs

Content.Server/Polymorph/Systems/PolymorphSystem.cs

@@ -170,15 +170,18 @@ public sealed partial class PolymorphSystem : EntitySystem
     }
 
     /// <summary>
-    /// Polymorphs the target entity into another
+    /// Polymorphs the target entity into another.
     /// </summary>
     /// <param name="uid">The entity that will be transformed</param>
-    /// <param name="configuration">Polymorph data</param>
-    /// <returns></returns>
+    /// <param name="configuration">The new polymorph configuration</param>
+    /// <returns>The new entity, or null if the polymorph failed.</returns>
     public EntityUid? PolymorphEntity(EntityUid uid, PolymorphConfiguration configuration)
     {
-        // if it's already morphed, don't allow it again with this condition active.
-        if (!configuration.AllowRepeatedMorphs && HasComp<PolymorphedEntityComponent>(uid))
+        // If they're morphed, check their current config to see if they can be
+        // morphed again
+        if (!configuration.IgnoreAllowRepeatedMorphs
+            && TryComp<PolymorphedEntityComponent>(uid, out var currentPoly)
+            && !currentPoly.Configuration.AllowRepeatedMorphs)
             return null;
 
         // If this polymorph has a cooldown, check if that amount of time has passed since the