Remove UEFI HTTP Boot config from dnsmasq

Not needed since iPXE chains to grubx64.efi for Blancco boot.
Simplifies DHCP config and avoids interfering with other UEFI clients.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

playbook/pxe_server_setup.yml

@@ -136,11 +136,6 @@
           dhcp-option=6,8.8.8.8
           enable-tftp
           tftp-root={{ tftp_dir }}
-          # HTTP Boot clients (UEFI) identify with vendor class "HTTPClient"
-          dhcp-vendorclass=set:httpboot,HTTPClient
-          dhcp-option-force=tag:httpboot,60,"HTTPClient"
-          dhcp-option-force=tag:httpboot,66,""
-          dhcp-boot=tag:httpboot,http://10.9.100.1/blancco/grubx64.efi
           dhcp-boot=ipxe.efi
           log-dhcp