Use Application.BaseDirectory when searching for OmniSharp.sln in MSBuildEnvironment
Use Application.BaseDirectory when searching for OmniSharp.sln in MSBuildEnvironment

OmniSharp/omnisharp-roslyn,OmniSharp/omnisharp-roslyn,DustinCampbell/omnisharp-roslyn,DustinCampbell/omnisharp-roslyn