refactor: remove logic of checking lua-resty-limit-traffic

[zll600]

Now the build-apisix-runtime.sh will report an error if lua-resty-limit-traffic does not exist.

apisix-build-tools/build-apisix-runtime.sh

Lines 149 to 158 in 6f1a404

	if [ ! -d "bundle/lua-resty-limit-traffic-$or_limit_ver" ]; then
	echo "ERROR: the official repository of lua-resty-limit-traffic has been updated, please sync to API7's repository." >&2
	exit 1
	else
	rm -rf bundle/lua-resty-limit-traffic-$or_limit_ver
	limit_ver=1.0.0
	wget "https://github.com/api7/lua-resty-limit-traffic/archive/refs/tags/v$limit_ver.tar.gz" -O "lua-resty-limit-traffic-$limit_ver.tar.gz"
	tar -xzf lua-resty-limit-traffic-$limit_ver.tar.gz
	mv lua-resty-limit-traffic-$limit_ver bundle/lua-resty-limit-traffic-$or_limit_ver
	fi

we can just keep the content of else branch and remove this check. looks like

rm -rf bundle/lua-resty-limit-traffic-$or_limit_ver
limit_ver=1.0.0
wget "https://github.com/api7/lua-resty-limit-traffic/archive/refs/tags/v$limit_ver.tar.gz" -O "lua-resty-limit-traffic-$limit_ver.tar.gz"
tar -xzf lua-resty-limit-traffic-$limit_ver.tar.gz
mv lua-resty-limit-traffic-$limit_ver bundle/lua-resty-limit-traffic-$or_limit_ver