dosbox-staging@0.82.0: Add drives folder to persist list

[farsil]

This PR adds the drives folder to the persist list of dosbox-staging, version 0.82.0. This is to enable persistence for the drives used in the automount feature, described in the default configuration file:

#                   automount: Mount 'drives/[c]' directories as drives on startup, where [c] is a lower-case
#                              drive letter from 'a' to 'y' (enabled by default). The 'drives' folder can be
#                              provided relative to the current directory or via built-in resources.
#                              Mount settings can be optionally provided using a [c].conf file along-side
#                              the drive's directory, with content as follows:
#                                [drive]
#                                type    = dir, overlay, floppy, or cdrom
#                                label   = custom_label
#                                path    = path-specification, ie: path = %%path%%;c:\tools
#                                override_drive = mount the directory to this drive instead (default empty)
#                                verbose = true or false

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[github-actions]

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dosbox-staging

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