Remove fixed number of iterations from benchmark.js

[toonijn]

As suggested in #392 (comment) the fixed number of iterations is removed.

@Qix- There are two possibilities:

• We could rely on the defaults of matcha (https://github.com/logicalparadox/matcha#defaults):

set('iterations', 100);     // the number of times to run a given bench
set('concurrency', 1);      // the number of how many times a given bench is run concurrently
set('type', 'adaptive');    // or 'static' (see below)
set('mintime', 500);        // when adaptive, the minimum time in ms a bench should run
set('delay', 100);          // time in ms between each bench

• Or we could provide our own.

I like the defaults best. So I just removed the two lines where we fix the number of iterations.

[Qix-]

Agreed. The maintainers of that library are going to know the best defaults for such benchmarks.

Thanks for opening the PR :)

[Qix-]

Thanks, apologies for the delay.