change virtual project file name

Author: Martin521

src/Runfs/Runfs.fs

@@ -20,7 +20,7 @@ type RunfsError =
 let ThisPackageName = "Runfs"
 let DependenciesHashFileName = "dependencies.hash"
 let SourceHashFileName = "source.hash"
-let ProjectName = $"artifact_of_{ThisPackageName}_that_can_be_deleted"
+let ProjectName = $"virtual_runfs_project"
 let ProjectFileName = ProjectName + ".fsproj"
 let AssemblyName = ThisPackageName
 let DllFileName = AssemblyName + ".dll"