Removing temporary hack to exclude prism2-usb-firmware-installer, the download...

Removing temporary hack to exclude prism2-usb-firmware-installer, the download homepage seems to work again (Closes: #783433).

scripts/build/chroot_firmware

@@ -103,9 +103,6 @@ then
 	done
 fi
 
-# Remove broken packages
-FIRMWARE_PACKAGES="$(echo ${FIRMWARE_PACKAGES} | grep -v prism2-usb-firmware-installer || true)"
-
 # Drop section and keep package names only
 for _PACKAGE in ${FIRMWARE_PACKAGES}
 do