FoundationEssentials: limit autosave to user domain

During the review for the changes to support Windows, we realized that
the location that is being used for the autosave information is only
available within the user domain mask. The Windows implementation was
corrected as part of the implementation, but this corrects the XDG
compliant path to reflect this reality.

Author: compnerd

Sources/FoundationEssentials/FileManager/SearchPaths/FileManager+XDGSearchPaths.swift

@@ -164,7 +164,7 @@ private enum _XDGUserDirectory: String {
 
 func _XDGSearchPathURL(for directory: FileManager.SearchPathDirectory, in domain: FileManager.SearchPathDomainMask) -> URL? {
     return switch (directory, domain) {
-    case (.autosavedInformationDirectory, _):
+    case (.autosavedInformationDirectory, .userDomainMask):
         _xdgDataHomeURL().appending(component: "Autosave Information", directoryHint: .isDirectory)
 
     case (.desktopDirectory, .userDomainMask):