Fix broken config file for db backup

pica-db-backup-rotation/config/backup_config.json

@@ -69,6 +69,7 @@
       "Day": 7,
       "Week": 4,
       "Month": 12
+    }
   },
   "castopod": {
     "Folder": "castopod",
@@ -77,6 +78,7 @@
       "Day": 7,
       "Week": 4,
       "Month": 12
+    }
   },
   "peertube": {
     "Folder": "peertube",
@@ -85,6 +87,7 @@
       "Day": 7,
       "Week": 4,
       "Month": 12
+    }
   },
   "lufi": {
     "Folder": "lufi",
@@ -93,5 +96,6 @@
       "Day": 7,
       "Week": 4,
       "Month": 12
+    }
   }
 }