[art] make the olive tree a source of wood, as it is hard to see that it is a food supply

Thread:
https://wildfiregames.com/forum/topic/73939-fruit-trees-are-too-difficult-to-tell-apart-from-other-trees/
Accepted by: @wowgetoffyourcellphone
Patch by: @marder
Differential Revision: https://code.wildfiregames.com/D4561
This was SVN commit r26675.

binaries/data/mods/public/maps/random/rmbiome/generic/aegean.js

@@ -7,7 +7,7 @@ function setupBiome_aegean()
 		]]);
 
 	g_Gaia.tree3 = pickRandom([
-		"gaia/fruit/olive",
+		"gaia/tree/olive",
 		"gaia/tree/juniper_prickly",
 		"gaia/tree/date_palm",
 		"gaia/tree/cretan_date_palm_short",

binaries/data/mods/public/simulation/templates/gaia/tree/olive.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Entity parent="template_gaia_fruit">
+<Entity parent="template_gaia_tree">
   <Footprint>
     <Height>10</Height>
   </Footprint>