add sps and sls file extensions for scheme

These extensions are the ones used automatically by the Akku package
manager when generating a new package, so they should probably be
added.

rc/filetype/scheme.kak

@@ -4,7 +4,7 @@
 # Detection
 # ‾‾‾‾‾‾‾‾‾
 
-hook global BufCreate (.*/)?(.*\.(scm|ss|sld)) %{
+hook global BufCreate (.*/)?(.*\.(scm|ss|sld|sps|sls)) %{
     set-option buffer filetype scheme
 }