remove self hosted expansion flag in favor of grouping hosted expansion with hosted purhcase and it's flag.

webapp/platform/types/src/config.ts

@@ -369,7 +369,6 @@ export type ServiceSettings = {
     EnableCustomGroups: boolean;
     SelfHostedPurchase: boolean;
     AllowSyncedDrafts: boolean;
-    SelfHostedExpansion: boolean;
 };
 
 export type TeamSettings = {