fix: fix encrypted file test error code and remove duplicated encrypted file test

Author: mpolomdeepsense

sample-docs/failing-encrypted.pdf

@@ -939,13 +939,13 @@ def test_encrypted_pdf():
         writer.encrypt(user_password="password123")
         writer.write(temp_file.name)
 
-        # Response should be 400
+        # Response should be 422
         response = client.post(
             MAIN_API_ROUTE,
             files=[("files", (str(temp_file.name), open(temp_file.name, "rb"), "application/pdf"))],
         )
         assert response.json() == {"detail": "File is encrypted. Please decrypt it with password."}
-        assert response.status_code == 400
+        assert response.status_code == 422
 
         # This file is owner encrypted, i.e. readable with edit restrictions
         writer = PdfWriter()
@@ -1160,7 +1160,6 @@ def test_include_slide_notes(monkeypatch, test_default, include_slide_notes, tes
 @pytest.mark.parametrize(
     ("pdf_name", "expected_error_message"),
     [
-        ("failing-encrypted.pdf", "File is encrypted. Please decrypt it with password."),
         (
             "failing-invalid.pdf",
             "File does not appear to be a valid PDF. Error: Stream has ended unexpectedly",