feat(content,port): port collapsible mop item

[shmakota]

Checklist

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Purpose of change

ports dda change
CleverRaven/Cataclysm-DDA#55965

Describe the solution

add the collapsible mop mop_folded item, which is a smaller, rarer version of the normal mop to incentivize players to clean things like acid off the floor more often while away from home.

adds mop_folded to the relevant itemgroups, and to areas where the normal mop is found with a lower chance. the change only splits the mop spawns between these two, and does not increase the rate of mop spawns overall.

Describe alternatives you've considered

Testing

tested item and spawn locations. the mop functions as expected when used. tested the cleaning item group and the collapsible mop spawns around 40-60% as often as the normal mop.

Additional context