fix(snippets):python-mode:change tryelse key

[lordgrenville]

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This is in line with the yasnippet-snippets repo, and prevents the warning "Multiple snippets with same identity"

There are two Python snippets with the same key (try and tryelse), creating a warning. This fixes it, bringing snippets in line with yasnippet-snippets.

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• [ x] My changes are not on the do-not-PR list for this project.
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