Makefile.ps5: Add missing assets to list.

install-ps5.c includes 6 assets, but only 3 are listed in the Makefile.
Missing ftpsrv-ps5.elf from the list allows make to try building
ftpsrv-ps5-install.elf before ftpsrv-ps5.elf is available.

Author: rootlis

Makefile.ps5

@@ -26,6 +26,7 @@ endif
 VERSION_TAG := $(shell git describe --abbrev=6 --dirty --always --tags)
 TITLE_ID    := BREW10001
 ASSETS      := assets/param.json assets/icon0.png assets/websrv.html
+ASSETS      += assets/xterm.min.js assets/xterm.min.css ftpsrv-ps5.elf
 
 CFLAGS := -Wall -Werror -DVERSION_TAG=\"$(VERSION_TAG)\" -I.
 CFLAGS += -DTITLE_ID=\"$(TITLE_ID)\"