Fix flowers detection when using ethereal

[Niklp09]

w/o patch + ethereal enabled:

{
        ["bakedclay:lazarus"] = "bakedclay:lazarus",
        ["bakedclay:mannagrass"] = "bakedclay:mannagrass",
        ["default:pine_bush_stem"] = "default:pine_bush_stem",
        ["default:acacia_bush_stem"] = "default:acacia_bush_stem",
        ["default:bush_stem"] = "default:bush_stem",
        ["bakedclay:delphinium"] = "bakedclay:delphinium",
        ["bakedclay:thistle"] = "bakedclay:thistle"
}
registered 7

w/ patch + ethereal enabled:

{
        ["flowers:waterlily_45"] = "flowers:waterlily",
        ["flowers:waterlily_675"] = "flowers:waterlily",
        ["flowers:waterlily_s1"] = "flowers:waterlily",
        ["default:bush_stem"] = "default:bush_stem",
        ["flowers:waterlily_s3"] = "flowers:waterlily",
        ["flowers:waterlily_s4"] = "flowers:waterlily",
        ["flowers:chrysanthemum_green"] = "flowers:chrysanthemum_green",
        ["flowers:dandelion_white"] = "flowers:dandelion_white",
        ["default:pine_bush_stem"] = "default:pine_bush_stem",
        ["flowers:geranium"] = "flowers:geranium",
        ["flowers:mushroom_brown"] = "flowers:mushroom_brown",
        ["flowers:mushroom_red"] = "flowers:mushroom_red",
        ["flowers:rose"] = "flowers:rose",
        ["flowers:tulip_black"] = "flowers:tulip_black",
        ["flowers:viola"] = "flowers:viola",
        ["flowers:waterlily"] = "flowers:waterlily",
        ["bakedclay:delphinium"] = "bakedclay:delphinium",
        ["bakedclay:thistle"] = "bakedclay:thistle",
        ["bakedclay:lazarus"] = "bakedclay:lazarus",
        ["bakedclay:mannagrass"] = "bakedclay:mannagrass",
        ["flowers:seaweed"] = "flowers:seaweed",
        ["flowers:seaweed_3"] = "flowers:seaweed",
        ["flowers:seaweed_2"] = "flowers:seaweed",
        ["default:acacia_bush_stem"] = "default:acacia_bush_stem",
        ["flowers:seaweed_4"] = "flowers:seaweed",
        ["flowers:dandelion_yellow"] = "flowers:dandelion_yellow",
        ["flowers:tulip"] = "flowers:tulip",
        ["flowers:waterlily_s2"] = "flowers:waterlily",
        ["flowers:waterlily_225"] = "flowers:waterlily"
}
registered 29