fix: simplify return statement in find_by method of ContentItemAssociations

Author: mconflitti-pbc

src/posit/connect/oauth/associations.py

@@ -101,8 +101,7 @@ def find_by(
 
             if match:
                 return association
-            else:
-                return None
+        return None
 
     def delete(self) -> None:
         """Delete integration associations."""