fix: peer routing for delegate router (libp2p#377)

* fix: peer routing tests

* test: fix mock payload type

Provider results are type 4, not type 1: https://github.com/libp2p/go-libp2p-core/blob/6e566d10f4a5447317a66d64c7459954b969bdab/routing/query.go#L15-L24

Author: vasco-santos

src/peer-routing.js

@@ -47,7 +47,7 @@ module.exports = (node) => {
       })
 
       tryEach(tasks, (err, results) => {
-        if (err && err.code !== 'NOT_FOUND') {
+        if (err) {
           return callback(err)
         }
         results = results || []

test/content-routing.node.js

@@ -251,7 +251,7 @@ describe('.contentRouting', () => {
             timeout: '1000ms',
             'stream-channels': true
           })
-          .reply(200, `{"Extra":"","ID":"QmWKqWXCtRXEeCQTo3FoZ7g4AfnGiauYYiczvNxFCHicbB","Responses":[{"Addrs":["/ip4/0.0.0.0/tcp/0"],"ID":"${provider}"}],"Type":1}\n`, [
+          .reply(200, `{"Extra":"","ID":"QmWKqWXCtRXEeCQTo3FoZ7g4AfnGiauYYiczvNxFCHicbB","Responses":[{"Addrs":["/ip4/0.0.0.0/tcp/0"],"ID":"${provider}"}],"Type":4}\n`, [
             'Content-Type', 'application/json',
             'X-Chunked-Output', '1'
           ])