v0.8.7.4 Hotfix

Edit: Updated to v0.8.7.4 in another attempt to fix a persistent bug with multi-hit attacks and Glaciate effects.

Minor hotfix. I corrected a possible bug in Chapter 6 that could cause the game to be unable to progress if you did the library objective last using some parts of the bookcase. I also included a retroactive fix for anyone who saved after doing this; re-entering the library should trigger it.