TBTR: Fix palette recolouring of templates

Fix group overrides affecting template image when cloning vehicle
Update template when changing company colours

Update template images on demand instead of at load

src/economy.cpp

@@ -51,6 +51,7 @@
 #include "linkgraph/refresh.h"
 #include "tracerestrict.h"
 #include "tbtr_template_vehicle.h"
+#include "tbtr_template_vehicle_func.h"
 #include "scope_info.h"
 #include "pathfinder/yapf/yapf_cache.h"
 
@@ -578,6 +579,8 @@ void ChangeOwnershipOfCompanyItems(Owner old_owner, Owner new_owner)
 
 	NotifyRoadLayoutChanged();
 
+	InvalidateTemplateReplacementImages();
+
 	cur_company.Restore();
 
 	RegisterGameEvents(new_owner != INVALID_OWNER ? GEF_COMPANY_MERGE : GEF_COMPANY_DELETE);