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

[lordgrenville]

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 ] I searched the issue tracker and this hasn't been PRed before.
• [ x] My changes are not on the do-not-PR list for this project.
• [ x] My commits conform to Doom's git conventions.

[hlissner]

Sorry for taking so long to get to this, it slipped under my radar. This issue plagued snippets across several modes, so I've fixed them all in 2bc978d, including the ones mentioned here. Thanks for bringing it to my attention!