rm prism type templates

tool/sync_default_gems.rb

@@ -413,6 +413,8 @@ module SyncDefaultGems
       cp_r("#{upstream}/templates", "prism/")
       rm_rf("prism/templates/javascript")
       rm_rf("prism/templates/java")
+      rm_rf("prism/templates/rbi")
+      rm_rf("prism/templates/sig")
 
       rm("prism/extconf.rb")
     else