Apply suggested fix to tna_utilities/flask/talisman.py from Copilot Autofix

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

Author: ahosgood

tna_utilities/flask/talisman.py

@@ -54,7 +54,6 @@ class Talisman:
 
     def __init__(self, app=None, **kwargs):
         if app is not None:
-            self.app = app
             self.init_app(app, **kwargs)
 
     def init_app(