Refactor Websocket tests

[gavv]

After introducing new chain.assert() method, we can simplify many websocket tests.

In websocket_test.go, find all table-driven tests that have assertOk field and refactor them as follows:

• replace assertOk bool with result chainResult
• instead of assertOk: true, use result: success
• instead of assertOk: false, use result: failure

• instead of:

  if tc.assertOk {
      ws.chain.assert(t, success)
  } else {
      ws.chain.assert(t, failure)
  }

  use:

  ws.chain.assert(t, tc.result)

[antara-gandhi]

@gavv i'd like to claim this issue!

[gavv]

@antara-gandhi welcome :)