An assertion also had IsOrContains arguments swapped

Author: jnm2

src/TfvcMigrator/RepositoryBranchMapping.cs

@@ -50,7 +50,7 @@ public RepositoryBranchMapping RenameRootDirectory(string oldPath, string newPat
         if (!PathUtils.IsAbsolute(newPath))
             throw new ArgumentException("New path must be absolute.", nameof(newPath));
 
-        if (!PathUtils.IsOrContains(oldPath, RootDirectory))
+        if (!PathUtils.IsOrContains(RootDirectory, oldPath))
             throw new InvalidOperationException("The rename does not apply to this mapping.");
 
         if (SubdirectoryMapping is not null)