Fix "term.fit is not a function" error when change padding value in the demo #3136
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When we change a padding value in the demo, a console error occurs and xterm is not correctly fitted.
![termfit](https://user-images.githubusercontent.com/29003390/96684094-0263c280-13b6-11eb-860b-30f9929e8085.png)
I replaced function call from term.fit() to addons.fit.instance.fit().