Confirm that insertions will only count as a single "alt" in this calculation

[ionox0]

In the tests for this noise module, there is a 5bp insertion in the test bam.

This results in a single Alt base in the test, which indicates that insertions of any length will only be counted as a single alt read. This means that insertions are included in base "acgt" noise calculation numbers, but only count as a single alt.