Do not save cursor in tresize.
Do not save cursor in tresize.

This patch fixes the bug introduced in
8f11e1cd034ff28ca47bb4955505db7fa8016ba8

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'

google/mt,google/mt