Remove duplicated import of lib

Author: rube200

src/OpenMod.Installer.RocketMod.csproj

@@ -9,7 +9,6 @@
   <ItemGroup>
     <PackageReference Include="Nito.AsyncEx.Context" Version="5.1.2" />
     <PackageReference Include="OpenMod.Core" Version="3.7.4" />
-    <PackageReference Include="OpenMod.NuGet" Version="3.7.4" />
     <PackageReference Include="OpenMod.UnityEngine.Redist" Version="2021.3.29.1" />
     <PackageReference Include="OpenMod.Unturned.Redist" Version="3.23.12.3" />
   </ItemGroup>