Update styled-jsx-postcss example (#3083)
Update styled-jsx-postcss example (#3083)

* Update babel-preset.js

As './dist/server/build/babel/preset' now return a function, in this example we need to first call the function and after that replace styled-jsx

* linting issues solved

kpdecker/next.js,zeit/next.js,JeromeFitz/next.js,zeit/next.js,flybayer/next.js,BlancheXu/test,azukaru/next.js,JeromeFitz/next.js,JeromeFitz/next.js,flybayer/next.js,BlancheXu/test,BlancheXu/test,azukaru/next.js,giacomorebonato/next.js,callumlocke/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,azukaru/next.js,flybayer/next.js,zeit/next.js