Minor formatting per ESLint feedback

A bit of formatting tweaks based on ESLint feedback. Clean code is happy code.

Current ESLint feedback is:
```sh
$ eslint {,src/}*.js src/{client,server,tests}

src/client/api.js
  5:0  error  Missing "use strict" statement  strict

src/server/api/github.js
  30:52  error  Expected error to be handled  handle-callback-err

src/server/api/user.js
  27:15  error  Expected error to be handled  handle-callback-err

src/server/app.js
   93:20  error  Expected error to be handled                                           handle-callback-err
  119:20  error  Expected error to be handled                                           handle-callback-err
  140:20  error  Expected error to be handled                                           handle-callback-err
  166:20  error  Expected error to be handled                                           handle-callback-err
  187:20  error  Expected error to be handled                                           handle-callback-err
  199:3   error  Expected error to be handled                                           handle-callback-err
  213:8   error  Expected an assignment or function call and instead saw an expression  no-unused-expressions

src/server/passports/github.js
  26:11  error  Expected error to be handled  handle-callback-err

src/server/services/status.js
  22:15  error  Expected error to be handled  handle-callback-err
   8:57  error  Expected error to be handled  handle-callback-err

src/server/webhooks/issues.js
  56:41  error  Expected error to be handled  handle-callback-err

src/server/webhooks/pull_request.js
  16:41  error  Expected error to be handled  handle-callback-err

src/server/wrap/gitdata.js
  11:12  error  'res' is not defined  no-undef

src/server/wrap/search.js
  18:15  error  Expected error to be handled  handle-callback-err

src/tests/server/api/issue.js
  48:23  error  Expected error to be handled  handle-callback-err
  85:23  error  Expected error to be handled  handle-callback-err

src/tests/server/api/settings.js
  27:26  error  Expected error to be handled  handle-callback-err
  47:26  error  Expected error to be handled  handle-callback-err

src/tests/server/api/star.js
   62:22  error  Expected error to be handled  handle-callback-err
  278:22  error  Expected error to be handled  handle-callback-err

src/tests/server/api/webhook.js
   76:25  error  Expected error to be handled  handle-callback-err
  108:25  error  Expected error to be handled  handle-callback-err
  128:28  error  Expected error to be handled  handle-callback-err
  170:28  error  Expected error to be handled  handle-callback-err

✖ 27 problems
```

Fixes #311 (kinda sorta). I'll claim that this addresses the formatting aspects of #311 and the errors listed above are "bugs" and I'll file a separate bug for easier tracking/discussion/arguing.
ESLint didn't like the confusing use of a comma here. :shrug: