Remove obsolete patches

• patches/apps/collectives/00001-Add-app-config-to-specify-default-app-folder-locatio.patch was released in Collectives v2.2.0 https://github.com/nextcloud/collectives/releases/tag/v2.2.0
• patches/apps/spreed/00002-Wrap-rooms-creation-in-transaction-8467.patch was released in https://github.com/nextcloud/spreed/pull/8531

Will address #10 (closed) and #12 (closed)