style: reformat test_gdpr.py and test_gmail_labels.py to fix black CI check

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/63618a76-39b3-43af-b7a8-be2ae3d3ec8a

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/tests/unit/test_gdpr.py

@@ -3,7 +3,6 @@ Unit tests for GDPR data masking utilities (core/gdpr.py).
 No database or HTTP layer required – pure function tests.
 """
 
-
 from app.core.gdpr import mask_email, mask_name, mask_from_header
 
 

backend/tests/unit/test_gmail_labels.py

@@ -3,7 +3,6 @@ Unit tests for Gmail label utilities (utils/gmail_labels.py).
 Pure function tests – no database or HTTP layer required.
 """
 
-
 from app.utils.gmail_labels import (
     DEFAULT_IMPORT_LABEL_TEMPLATES,
     MAX_IMPORT_LABELS,