The path of liblib.so in IronSHTServer/Program.cs

Hi,

In an Ubuntu environment, compiling IronSHT will generate liblib.so in the root directory ( `verified-ironkv/` ). The path for importing this file in `IronSHTServer/Program.cs` is '`../liblib.so`', which seems to be incorrect when running the service from the root directory. Changing it to '`./liblib.so`' allows it to run correctly.