Default: Change to 'pixelbox2' long grass textures by Gambit

mods/default/textures/default_grass_1.png

mods/default/textures/default_grass_2.png

mods/default/textures/default_grass_3.png

mods/default/textures/default_grass_4.png

mods/default/textures/default_grass_5.png