Replace tab by space to follow PEP8 recommendation.

controllers/default.py

controllers/plugin_dbui.py

controllers/reports.py

models/db_database.py

models/db_defaults.py

models/db_languages.py

models/db_widgets.py

models/plugin_dbui.py

modules/plugin_dbui/__init__.py

modules/plugin_dbui/basesvc.py

modules/plugin_dbui/cfgsvc.py

modules/plugin_dbui/dbsvc.py

modules/plugin_dbui/foreignfield.py

modules/plugin_dbui/setfield.py

modules/plugin_dbui/tools.py