Revert "sets MASTER_NODE to blade-canongate, not pi-broughton"

This reverts commit 0f397b0ee3.

make/vars.mk

@@ -7,7 +7,7 @@ HOSTNAMES := pi-broughton blade-canongate
 MODULES_pi-broughton := http gemini smtp vaultwarden ln
 MODULES_blade-canongate := etherpad
 ALL_MODULES := $(sort $(foreach hostname,$(HOSTNAMES),$(MODULES_$(hostname))))
-MASTER_NODE := blade-canongate
+MASTER_NODE := pi-broughton
 IS_MASTER_NODE := $(filter $(MASTER_NODE),$(HOSTNAME))
 NGINX_MODULES := $(if $(IS_MASTER_NODE),$(ALL_MODULES))
 MODULES := $(MODULES_$(HOSTNAME))