Remove nap plus version override

Author: ciarams87

Makefile

@@ -6,12 +6,11 @@ DATE = $(shell date -u +"%Y-%m-%dT%H:%M:%SZ")
 VERSION = $(GIT_TAG)-SNAPSHOT-$(GIT_COMMIT_SHORT)
 TAG = $(VERSION:v%=%)
 TARGET ?= local
-NAP_PLUS_VERSION ?= r24
 
 override DOCKER_BUILD_OPTIONS += --build-arg IC_VERSION=$(VERSION) --build-arg GIT_COMMIT=$(GIT_COMMIT) --build-arg DATE=$(DATE)
 DOCKER_CMD = docker build $(DOCKER_BUILD_OPTIONS) --target $(TARGET) -f build/Dockerfile -t $(PREFIX):$(TAG) .
 PLUS_ARGS = --build-arg PLUS=-plus --build-arg FILES=plus-common --secret id=nginx-repo.crt,src=nginx-repo.crt --secret id=nginx-repo.key,src=nginx-repo.key
-NAP_ARGS = --build-arg FILES=nap-common --build-arg NGINX_PLUS_VERSION=$(NAP_PLUS_VERSION)
+NAP_ARGS = --build-arg FILES=nap-common
 
 export DOCKER_BUILDKIT = 1