🐛 Fix for Variable Name in Triangle Instrument Class

[Kianzahrai]

Per issue #26, this PR aims to resolve the issue, and only this issue.

This is a bug I came across when studying the AVM framework as part of my search (no pun intended) and study of local heuristic search algorithms (alongside Hill Climbing and Simulated Annealing). During my study, I was constructing a CFG (Control-Flow Graph) for some methods throughout the framework, and when attempting on the classify method in this Triangle class, I wanted to raise this issue.

The change is very simple, but I won't say it "must be" approved before other reviewers are involved.

In terms of adding labels (I am not able to), I would suggest adding the "bug" label to this.

Note: the strikethrough criteria are not applicable to this PR.

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