Register group for dry flora

This represents plant matter that may be
"dead" more or less and could be used for
thatch or adding plant fibers to things.

mods/nc_flora/flowers.lua

@@ -102,7 +102,8 @@ for shapeid = 1, #shapes do
 				snappy = 1,
 				flower_wilted = 1,
 				flammable = 1,
-				attached_node = 1
+				attached_node = 1,
+				flora_dry = 1
 			},
 			sounds = nodecore.sounds("nc_terrain_swishy"),
 			selection_box = {

mods/nc_flora/rushes.lua

@@ -46,7 +46,8 @@ minetest.register_node(modname .. ":rush_dry", {
 		groups = {
 			snappy = 1,
 			flammable = 2,
-			attached_node = 1
+			attached_node = 1,
+			flora_dry = 1
 		},
 		sounds = nodecore.sounds("nc_terrain_swishy"),
 		selection_box = nodecore.fixedbox({-3/8, -1/2, -3/8, 3/8, 1/4, 3/8})

mods/nc_flora/sedges.lua

@@ -43,6 +43,7 @@ for i = 1, 5 do
 				snappy = 1,
 				flora = 1,
 				flora_sedges = 1,
+				flora_dry = 1,
 				flammable = 3,
 				attached_node = 1
 			},