Loading gist should not load the default mandelbrot first

[certik]

This URL:

https://dev.lfortran.org/?gist=certik/7e2652943bbff7f0d0963dd4fcf1813a

First loads Mandelbrot (and sometimes even evaluates it!), and only then it reloads it with the gist.

Instead, it should load the gist directly, without loading mandelbrot first.