need update file path in demo code

[ettoolong]

Some file paths in manifest.json are wrong, e.g.:
tcp demo and p2p-chat demo

the
"schema": "../../src/toolkit/components/extensions/tcp.json",
should be
"schema": "../../src/toolkit/components/extensions/schemas/tcp.json",

the
"schema": "../../src/toolkit/components/extensions/udp.json",
should be
"schema": "../../src/toolkit/components/extensions/schemas/udp.json",