Clearing placements on disable

Optimization when we don't want to cache block placements that we don't need.

src/main/java/me/rigamortis/seppuku/impl/module/combat/ObsidianReplaceModule.java

@@ -127,8 +127,8 @@ public final class ObsidianReplaceModule extends Module {
     }
 
     @Override
-    public void onToggle() {
-        super.onToggle();
+    public void onDisable() {
+        super.onDisable();
         placementRequests.clear();
     }