Define a reasonable minimum size

Previously, in commit c49fbfb (Set minimum width and height in window
geometry, 2021-06-17), we set the minimum size of the window to one
cell. We do not yet include our fixes from 89f8571 (Calculate base_width
dynamically, 2021-06-18) and so do not account for the scrollbar when
setting the minimum size hints.

A minimum size of one cell can lead to issues like [1] when resizing
aggressively. A fix for this has been committed in [2], but not yet
merged to any release branch. Setting the minimum size to larger values
seems to work around this problem.

Therefore, define a minimum window size of 28 x 3 cells - just big
enough to still fit the search overlay. Make sure to include base_height
and base_width so that the right size will be reported to the window
manager.

[1] https://gitlab.gnome.org/GNOME/vte/-/issues/340
[2] https://gitlab.gnome.org/GNOME/vte/-/commit/b333d66879963637099dc0bc5a702f50f34da67e

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