fix: rebalancing strategy period in portfolio link to okama.io

Author: chilango74

okama/portfolio.py

@@ -2356,7 +2356,7 @@ def okamaio_link(self) -> str:
         new_url += f"&first_date={self.first_date.strftime('%Y-%m-%d')}"
         new_url += f"&last_date={self.last_date.strftime('%Y-%m-%d')}"
         # TODO: change rebalancing strategy in the link
-        new_url += f"&rebal={self.rebalancing_strategy}"
+        new_url += f"&rebal={self.rebalancing_strategy.period}"
         new_url += f"&symbol={self.symbol}"
         return new_url