Reduce log collection size from 1000 to 50

LeStorage/StoreCenter.swift

@@ -465,7 +465,7 @@ public class StoreCenter {
         if let logs = self._logs {
             return logs
         } else {
-            let logsCollection: StoredCollection<Log> = Store.main.registerCollection(synchronized: false, limit: 1000)
+            let logsCollection: StoredCollection<Log> = Store.main.registerCollection(synchronized: false, limit: 50)
             self._logs = logsCollection
             return logsCollection
         }