Config.in.legacy: fix BR2_PACKAGE_SCONESERVER_HTTP_SCONESITE_IMAGE

Commit fdb6fc2b4a5be747e7695f594cbbb1a941ceb05b forgot to select
BR2_LEGACY

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

Config.in.legacy

@@ -148,6 +148,7 @@ comment "Legacy options removed in 2021.05"
 
 config BR2_PACKAGE_SCONESERVER_HTTP_SCONESITE_IMAGE
 	bool "sconeserver http::sconesite::image removed"
+	select BR2_LEGACY
 	help
 	  Sconeserver cannot be built with ImageMagick - it uses the
 	  "transofrm" function which is removed from public API.