set is_ground_content for all (thx SwissAlpS)

crops/pepper.lua

@@ -60,6 +60,7 @@ minetest.register_node("farming:pepper_ground", {
 		vessel = 1, food_pepper_ground = 1,
 		dig_immediate = 3, attached_node = 1, compostability = 30
 	},
+	is_ground_content = false,
 	sounds = farming.sounds.node_sound_defaults(),
 	selection_box = {
 		type = "fixed",
@@ -94,6 +95,7 @@ local def = {
 		handy = 1, snappy = 3, flammable = 3, plant = 1, attached_node = 1,
 		not_in_creative_inventory = 1, growing = 1
 	},
+	is_ground_content = false,
 	sounds = farming.sounds.node_sound_leaves_defaults()
 }