use more generic room type instead of boolean flag

src/stores/ThreepidInviteStore.ts

@@ -16,6 +16,7 @@ limitations under the License.
 
 import EventEmitter from "events";
 import { base32 } from "rfc4648";
+import { RoomType } from "matrix-js-sdk/src/@types/event";
 
 // Dev note: the interface is split in two so we don't have to disable the
 // linter across the whole project.
@@ -55,7 +56,7 @@ export interface IOOBData {
     inviterName?: string; // The display name of the person who invited us to the room
     // eslint-disable-next-line camelcase
     room_name?: string; // The name of the room, to be used until we are told better by the server
-    isSpaceRoom?: boolean; // Whether or not we think the room is actually a space
+    roomType?: RoomType; // The type of the room, to be used until we are told better by the server
 }
 
 const STORAGE_PREFIX = "mx_threepid_invite_";