Drop firmware-b43 entirely

The package might come back in Debian, or we might bring it back in Kali
(if there is demand for it). However, the discussion at
https://bugs.debian.org/1109025 suggests that the firmware blobs are not
redistributable.

kali-config/common/package-lists/hardware-support.list.chroot

@@ -1,15 +1,9 @@
 ##
-## The b43 firmware require network access, hence are not dependencies of
-## kali-linux-firmware. But we install those in the live image anyway,
-## since we have network access when we build the live ISO.
-##
-## 2025-07-10: https://www.lwfinger.com is down, so no b43 firmware
+## Make sure we have firmware installed. This is actually redundant, since
+## recent versions of live-build have some built-in logic to automatically
+## install firmware anyway.
 ##
 kali-linux-firmware
-## #if ARCHITECTURES i386 amd64
-## firmware-b43legacy-installer
-## firmware-b43-installer
-## #endif
 
 ##
 ## Make sure we install as many input/video drivers as we can. Note that