fix to update total when selecting item through mouse click
fix to update total when selecting item through mouse click

andrewmoko/openmrs-module-openhmis.cashier,andrewmoko/openmrs-module-openhmis.cashier,k-joseph/openmrs-module-openhmis.cashier,k-joseph/openmrs-module-openhmis.cashier,andrewmoko/openmrs-module-openhmis.cashier,k-joseph/openmrs-module-openhmis.cashier