Fix email mismatch error message

src/user.ts

@@ -411,7 +411,7 @@ export class Session {
 				});
 				const payload = ticket.getPayload()!; // dunno why this would happen.
 				if (payload.email?.toLowerCase() !== userData.email.slice(0, -1).toLowerCase()) {
-					throw new ActionError(`Wrong Google account for this Showdown account (must be ${userData.email.slice(0, -1)} not ${payload.email})`);
+					throw new ActionError(`Wrong Google account for this Showdown account (${payload.email} doesn't match this account)`);
 				}
 				return true;
 			} catch (e) {