Center the trunk of the azalea tree schematic

The trunk of the azalea tree is off center in the schematic so placing it with
random rotation makes predicting where the trunk will end up impossible.

This enlarges the schematic to 7x6x7 blocks with the trunk in the center.

mods/ITEMS/mcl_lush_caves/init.lua

@@ -121,7 +121,7 @@ function mcl_lush_caves.makeazalea(pos,def,pr)
 			end
 		end
 	end
-	minetest.place_schematic(vector.offset(surface_pos,-2,0,-2),modpath.."/schematics/azalea1.mts","random",nil,nil,"place_center_x place_center_z")
+	minetest.place_schematic(vector.offset(surface_pos,-3,0,-3),modpath.."/schematics/azalea1.mts","random",nil,nil,"place_center_x place_center_z")
 	minetest.log("action","[mcl_lush_caves] Azalea generated at "..minetest.pos_to_string(surface_pos))
 	return true
 end