Restore Attribute/Skill should allow restoring drained attributes
In OpenMW only Damaged attributes/skills can be restored. In vanilla MW any negative modifier can be restored. Fixing this will involve a rewrite of the magic effect system.
Steps to reproduce: ingest "p_drain_strength_q" and "p_restore_strength_s" potions.
(RM-2446 from redmine: created on 2015-03-11 by scrawl ., , closed on 2018-05-23 by R. D.)