add multicategory mock to mock lists
add multicategory mock to mock lists

- making sure multicategory axes are tested
  during the react-noop test and during the minified bundle tests

plotly/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,asolagmbh/plotly.js,aburato/plotly.js