tailscale: update tailfs file and package names (#11590)

This change updates the tailfs file and package names to their new
naming convention.

Updates #tailscale/corp#16827

Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>

drive/remote_nonunix.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build !unix
+
+package drive
+
+func doAllowShareAs() bool {
+	// On non-UNIX platforms, we use the GUI application (e.g. Windows taskbar
+	// icon) to access the filesystem as whatever unprivileged user is running
+	// the GUI app, so we cannot allow sharing as a different user.
+	return false
+}