mtp: use "storage-description (hex-storage-id)" storage name format only when necessary
mtp: use "storage-description (hex-storage-id)" storage name format only when necessary

This patch implements on-demand post-fixing of storage description with ID for storage name, i.e., only in cases, when description itself is not unique.

Signed-off-by: Rok Mandeljc <883aac631e8c222ad7fb3cf8ce1133e652b9b999@gmail.com>

gicmo/gvfs,gicmo/gvfs,gicmo/gvfs,gicmo/gvfs