osc: full reinit on runtime option changes

Fuck it, just let's just reinit everything.

On a side note, the changelist parameter provided by read_options()
(here "list") is now unused. But it's not hard to provide and might be
useful for other stuff. So don't remove it from the generic
read_options() code.

player/lua/osc.lua

@@ -1642,9 +1642,8 @@ end
 function update_options(list)
     validate_user_opts()
     request_tick()
-    if list["visibility"] then
-        visibility_mode(user_opts.visibility, true)
-    end
+    visibility_mode(user_opts.visibility, true)
+    request_init()
 end
 
 -- OSC INIT