EventPlot: increase requirejs timetout
EventPlot: increase requirejs timetout

requirejs can timeout when loading EventPlot.js in notebooks with many
EventPlots and ILinePlots running in slow machines using Firefox.  As
a result, all EventPlots are empty.  Double the requirejs timeout (the
default is 7s) to give Firefox enough time to execute all the javascript
and load EventPlot.js

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