Raise default connection pool size.

    <!-- The restoring is handled by modem if it is true-->

    <bool translatable="false" name="skip_restoring_network_selection">false</bool>

    <!-- Number of database connections opened and managed by framework layer

    <!-- Maximum number of database connections opened and managed by framework layer

         to handle queries on each database. -->

    <integer name="db_connection_pool_size">1</integer>

    <integer name="db_connection_pool_size">4</integer>

    <!-- Max space (in MB) allocated to DownloadManager to store the downloaded

         files if they are to be stored in DownloadManager's data dir,