Revert "Use one log file per nextcloud instance"

This reverts commit 23f6f08a18.

scripts/install

@@ -244,7 +244,7 @@ exec_occ background:cron
 #=================================================
 # POST-INSTALL MAINTENANCE
 #=================================================
-(cd /tmp ; at now + 10 minutes <<< "(cd $final_path ; sudo -u $app php occ db:add-missing-indices ; sudo -u $app php occ db:convert-filecache-bigint -n) > /tmp/${app}_maintenance.log")
+(cd /tmp ; at now + 10 minutes <<< "(cd $final_path ; sudo -u $app php occ db:add-missing-indices ; sudo -u $app php occ db:convert-filecache-bigint -n) > /tmp/nextcloud_maintenance.log")
 
 #=================================================
 # CONFIGURE THE HOOK FILE FOR USER CREATE

scripts/upgrade.d/upgrade.last.sh

@@ -12,5 +12,5 @@ last_upgrade_operations () {
   cp -a ../sources/patches_last_version/* ../sources/patches
 
   # Execute post-upgrade operations later on
-  (cd /tmp ; at now + 10 minutes <<< "(cd $final_path ; sudo -u $app php occ db:add-missing-indices ; sudo -u $app php occ db:convert-filecache-bigint -n) > /tmp/${app}_maintenance.log")
+  (cd /tmp ; at now + 10 minutes <<< "(cd $final_path ; sudo -u $app php occ db:add-missing-indices ; sudo -u $app php occ db:convert-filecache-bigint -n) > /tmp/nextcloud_maintenance.log")
 }