replace special characters with _ in homebutton.css file creation

Author: tim-salabim

NEWS.md

@@ -4,6 +4,8 @@
 
 #### 🐛 bug fixes
 
+  * use layerId instead of group for fgb files. Adresses https://github.com/r-spatial/mapview/issues/505
+
 #### 💬 documentation etc
 
 #### 🍬 miscellaneous

R/homebutton.R

@@ -118,7 +118,9 @@ addHomeButton <- function(map, ext, group = "layer",
 
     path_layer = tempfile()
     dir.create(path_layer)
-    path_layer = paste0(path_layer, "/", group, "_home-button.css")
+    path_layer = paste0(
+      path_layer, "/", gsub("[[:punct:] ]", "_", group), "_home-button.css"
+    )
     writeLines(css_txt, path_layer)