Remove unused encryption mode setting

src/tests/test_default_encryption_mode.py

@@ -0,0 +1,11 @@
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from password_manager.manager import PasswordManager
+from utils.key_derivation import DEFAULT_ENCRYPTION_MODE
+
+
+def test_default_encryption_mode():
+    assert PasswordManager.__init__.__defaults__[0] is DEFAULT_ENCRYPTION_MODE