Can't delete older Garageband (dfguitarampuserslotview.nib in use)
I am helping a friend update his MacBook Pro retina with a 128GB SSD running Mojave.
I have put Garageband in the trash, but I cannot delete it completely. I'm left with a 0KB application that won't delete because it thinks it's in use. The file path is GarageBand ▸ Contents ▸ Resources ▸ ru.lproj and it's called DfGuitarAmpUserSlotView.nib.
Any ideas how to delete this? TIA!
MacBook Pro Retina