hwcontext_vulkan: set hwctx->device_features

This was forgotten during the recent device feature refactor.

libavutil/hwcontext_vulkan.c

@@ -1638,6 +1638,9 @@ static int vulkan_device_create_internal(AVHWDeviceContext *ctx,
             p->disable_multiplane = strtol(opt_d->value, NULL, 10);
     }
 
+    /* Set the public device feature struct and its pNext chain */
+    hwctx->device_features = p->feats.device;
+
     /* Set the list of all active extensions */
     hwctx->enabled_dev_extensions = dev_info.ppEnabledExtensionNames;
     hwctx->nb_enabled_dev_extensions = dev_info.enabledExtensionCount;