UtBS S1: change terrain code of the death tree hex

Visually it has no effect since the embelishment is
covered by the tree image.
In the help it is now not only displayed as grass.

[ci skip]

data/campaigns/Under_the_Burning_Suns/maps/01_The_Morning_After.map

@@ -26,7 +26,7 @@ Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd^Dc, Dd, Dd, Dd^Es, Dd, Cd
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+Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd^Es, Cdr, Ds^Es, Ds, Dd^Dc, Rd, Ds, Ds, Dd^Dc, Ds^Ftd, Wwt, Wwf, Wot, Ww^Ewl, Gd^Es, Gd^Dr, Gs^Es, Ww^Ewl, Wot, Wwt, Wot, Wwt, Gs, Gs^Es, Ww^Bw|, Wwt, Gs^Es, Gd, Dd^Dr, Dd^Dr, Dd, Dd, Dd, Dd^Dc, Dd, Dd, Dd, Dd, Rd, Dd, Dd, Dd, Dd, Dd^Dc, Dd, Dd
 Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd, Dd^Dc, Dd, Dd, Dd, Dd, Dd, Dd^Es, Dd^Dc, Cdr, Ds^Es, Dd^Dr, Ds, Rd, Ds^Es, Dd^Dr, Ds, Ds^Ftd, Wot, Wot, Wot, Wwt, Wwt, Gd, Wwt, Wwt, Wot, Wot, Wwt, Wwt, Wwt, Wwt, Gs^Es, Gs, Gs, Gd^Vc, Cdr, Dd^Es, Dd^Es, Dd^Es, Dd, Dd, Rd, Rd, Rd, Dd, Gd, Rd, Rd, Rd, Rd, Dd, Dd, Dd
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