Fix drop fps after surge Clear Sky and Call of Pripyat

[olegwolf008]

File vibros_p.ppe is missing from official Call of Pripyat and Clear Sky game archives but is
referenced in xr_effects.script -> start_small_reject():

level.add_pp_effector("vibros_p.ppe", 1974, false)

This causes engine to hang when loading missing file during surge event,
resulting in permanent FPS drop that doesn't recover after surge ends.

File exists in Shadow of Chernobyl archives. Copying it to CoP
gamedata\anims\ fixes the issue.

Possible cause: missing file in original CoP release or corrupted repacks.

[argosurvivors]

#2080