Revert "Upgrade to upstream version 15.0.0 (fix)"

This reverts commit 85ada3ed38.

scripts/upgrade.d/upgrade.14.sh

@@ -1,7 +1,10 @@
 #!/bin/bash
 
 # Last available nextcloud version
-next_version="15.0.0"
+next_version="14.0.4"
 
 # Nextcloud tarball checksum sha256
-nextcloud_source_sha256="5bb0c58171353da844019b64080c21078002a59ab956ab72adb958844a98eb78"
+nextcloud_source_sha256="4f5dd15a71694bd2f15fba0d2f942e5a5b1f5aba13511c507a23324d746b40e8"
+
+# Patch nextcloud files only for the last version
+cp -a ../sources/patches_last_version/* ../sources/patches