Fixed incorrect default map size value

Author: ilyalukyanov

src/LightningDB/LightningConfig.cs

@@ -18,7 +18,7 @@ public static class Environment
             /// <summary>
             /// Default MapSize for new environments
             /// </summary>
-            public const long LibDefaultMapSize = 10485760;
+            public const long LibDefaultMapSize = 1048576;
 
             /// <summary>
             /// Default MaxReaders for new environments