LIMS-996: Trim empty space around courier name

[ndg63276]

Ticket: LIMS-996

Changes:

• Trim courier name before comparing to 'dhl', otherwise couriers like ' dhl' and 'dhl ' will be rejected.

Tests:

• Go to a test shipment eg on mx23694, edit courier name to 'DHL', check 'Create Air Waybill' button remains after refresh
• Edit courier name to ' DHL', check button remains after refresh
• Edit courier name to 'Fedex', check button has gone after refresh