v2.0.1: hero is now busy after opening spellbook window, fixes exploits

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/artifacts/UnstableSpellbook.java

@@ -171,6 +171,7 @@ public class UnstableSpellbook extends Artifact {
 							//do nothing
 						}
 					});
+					hero.busy();
 				} else {
 					scroll.doRead();
 					Talent.onArtifactUsed(Dungeon.hero);