Update Stock Function

UpdateStock function in databaseConnection.cs used in StockControl.cs
file...
Merge remote-tracking branch 'origin/master'

Conflicts:
	Motor Yard inventory/Motor Yard/bin/Debug/Motor Yard.exe
	Motor Yard inventory/Motor Yard/bin/Debug/Motor Yard.pdb
	Motor Yard inventory/Motor Yard/bin/Debug/web_inventory.accdb
	Motor Yard inventory/Motor
Yard/obj/Debug/DesignTimeResolveAssemblyReferencesInput.cache
	Motor Yard inventory/Motor Yard/obj/Debug/Motor
Yard.csproj.FileListAbsolute.txt
	Motor Yard inventory/Motor Yard/obj/Debug/Motor
Yard.csproj.GenerateResource.Cache
	Motor Yard inventory/Motor Yard/obj/Debug/Motor Yard.exe
	Motor Yard inventory/Motor Yard/obj/Debug/Motor Yard.pdb
	Motor Yard inventory/Motor
Yard/obj/Debug/TempPE/web_inventoryDataSet.Designer.cs.dll