Update Slooop to 3.2.51

Andrew Pozdnakovrequested to merge
andrewpozdnakov7/fdroiddata:io.dashchan2-3.2.51 into master

Update Slooop from 3.2.49 to 3.2.51 with photo/video navigation, gallery refresh, interface customization and player fixes. The existing recipe and native source pins are unchanged; the reference source differs from the GitHub release only by its subsequent stable-update manifest commit.

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