[IMP] hr_timesheet: Small cleaning and linting

addons/account/security/account_security.xml

addons/hr_timesheet/data/hr_timesheet_data.xml

addons/hr_timesheet/models/hr_timesheet.py

addons/hr_timesheet/models/project.py

addons/hr_timesheet/models/timer_mixin.py

addons/hr_timesheet/security/hr_timesheet_security.xml

addons/hr_timesheet/static/src/js/Timer.js

addons/hr_timesheet/static/src/js/timer.js

addons/hr_timesheet/static/src/js/timesheet_uom.js

addons/hr_timesheet/static/src/scss/timer_button.scss

addons/hr_timesheet/views/hr_timesheet_views.xml

addons/sale/models/sale.py

addons/sale_timesheet/models/account_move.py

addons/sale_timesheet/models/project_overview.py

addons/sale_timesheet/models/sale_order.py

addons/sale_timesheet/wizard/sale_make_invoice_advance.py