attribute invite codes to admins/moderators

What does this MR do?

when a regular user (who has the appropriate permissions) creates an invite, we record that user's id in the createdById column (see https://activitypub.software/TransFem-org/Sharkey/-/blob/feature%2Fattribute-invites-to-mods/packages/backend/src/server/api/endpoints/invite/create.ts#L77-78 )

but when an admin/mod creates an invite via the control panel, we didn't

now we do

thanks to Rire on Discord for making me look

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packages/backend/src/server/api/endpoints/admin/invite/create.ts

@@ -68,6 +68,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			for (let i = 0; i < ps.count; i++) {
 				ticketsPromises.push(this.registrationTicketsRepository.insertOne({
 					id: this.idService.gen(),
+					createdBy: me,
+					createdById: me.id,
 					expiresAt: ps.expiresAt ? new Date(ps.expiresAt) : null,
 					code: generateInviteCode(),
 				}));