Do not save cursor in tresize.

This patch fixes the bug introduced in
8f11e1cd03

To reproduce the bug:
1. Save cursor: printf '\e[s'
2. Load cursor: printf '\e[u'
3. Resize st window.
4. Load cursor again: printf '\e[u'
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Gitea Version: 1.28.0+dev-505-g31b4d79a84