bug: filter subscription is not working on cold start

[weboko]

Problem

When js-waku tab is open for first time sometimes Filter doesn't work

Solution

Investigate and fix

[vpavlin]

I think I've seen this too, but it started working after a while (even without reload, I believe, but I will check again)

[weboko]

It seems that peer:identify kicks in later so that when js-waku has already a connection - it usually not negotiated fully so waitForPeers starts waiting for new peer:identify events

If it is the case that means that:

• if waitForPeers is used - it will block execution unless there are more than one node present;
• if waitForPeers is not used but subscription is getting initiated right after dial / bootstrap of the node - it might not have peers / protocols populated at that point in time (see picture);