Added indication of Trv unit to the window that appears when using Take/Give

Added indication of Trv unit name to the window that appears when using Take/Give commands, etc.

Previously, when performing Take/Give, the window did not indicate "which unit will be received" and was plainly inconvenient. This is not a problem in most cases, but sometimes make accidents when there is multiple units are carried and the received is not the one he or she was looking for. This change will prevent such accidents.

This window is also used for staves, so the Trv unit name will be displayed in that case as well. This display is not necessary in situations other than Take/Give, but there is no reason to go to the trouble of reassigning the process and removing the display, so I have left it as it is.

Note that I considered displaying only the unit name and their build, as in GBA FE, but I thought it would not be a good idea to reduce the information, so I decided to improve the display by added the information.