If you update the info.json file to this, it should work (I also changed the mod version for myself, but that shouldn't be necessary):
{
"name":"CleanTiles",
"version":"1.0.2",
"title":"Clean Tiles",
"author":"AndrolGenhald",
"description":"Always remove decoratives when placing tiles",
"factorio_version": "1.1.21",
"dependencies": ["base >= 1.1.21"]
}
