[d3d9] Clear dirty box regardless of texture pool

Otherwise we keep repacking and copying the whole texture
for every single lock. This causes performance problems
in Star Wars: The Old Republic.

src/d3d9/d3d9_device.cpp

@@ -4277,7 +4277,7 @@ namespace dxvk {
 
     if (shouldFlush) {
         this->FlushImage(pResource, Subresource);
-        if (pResource->IsManaged() && !pResource->IsAnySubresourceLocked())
+        if (!pResource->IsAnySubresourceLocked())
           pResource->ClearDirtyBoxes();
     }