Fix --most-allocations with the value of 0

[pablogsal]

In the docs we say that a value of 0 will show all entries but
currently the plugin crashes because it interprets the value of 0 as a
string and is not properly propagated to show all entries.

*Issue number of the reported bug or feature request: #46

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[godlygeek]

CI failed because our lint checks are broken on main.

#95 will fix that, and then this will need to be rebased once that lands.

[godlygeek]

Actually, I'll just land this despite the failing lint check. No reason to hold this one up given that CI for main is already failing, and I've tested locally that rebasing on #95 would make linting pass.

[godlygeek]

LGTM