fix(restapi init): wrong install of filter rest api

[NagyZoltanPeter]

Description

Filter rest api installation was rely on wrong configuration argument. --filter was checked (which is intended to filter service) instead of --filternode (that one is for filter client support).

Changes

• Correct configuration argument check
• added additional check whether filter client protocols are properly mounted.
• As realized that lightpush rest api also lacks this check I added it here.

How to test

1. run: wakunode2 --relay --filter --lightpush --rest=true --rest-port=11111
   a. should not crash, but start properly
2. run: curl -i -X GET "http://127.0.0.1:11111/filter/v2/subscriptions/111" -H "accept: application/json"
   a. should return Http404
3. run: wakunode2 --relay --filternode= --rest=true --rest-port=11112
4. run: curl -i -X GET "http://127.0.0.1:11112/filter/v2/subscriptions/111" -H "accept: application/json"
   a. must return Some meaing full json response with or without error code.

Issue

bug: SIGSEGV when Filter and REST are configured

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:2133

Built from 2495e56

[gabrielmer]

LGTM, thanks so much!