When resolving +1 weapons, replaced check for inheritance from Weapon

with check for *improved_version* method.

Fixes https://github.com/canismarko/dungeon-sheets/issues/112

dungeonsheets/make_sheets.py

@@ -113,7 +113,6 @@ def create_random_tables_content(
 ) -> str:
     template = jinja_env.get_template(f"random_tables_template.{suffix}")
     return template.render(
-        conjure_animals=True,
         tables=tables,
         use_dnd_decorations=use_dnd_decorations,
     )