Remove Twitter s/t tracking parameters

The `s` parameter seems to correspond to what type of device shared the
Twitter URL (12 = Twitter for iOS, 20 = Twitter website, etc). `t`
appears to be some sort of rotating tracker associated with the person
who shared the URL; I've seen Twitter URLs shared by one person with the
same `t` parameter for a few days, then their parameter changes and the
old one doesn't seem to be used again.

https://github.com/libredirect/libredirect/issues/532

src/assets/javascripts/services.js

@@ -132,6 +132,8 @@ function redirect(url, type, initiator, forceRedirection) {
 
 			search.delete("ref_src")
 			search.delete("ref_url")
+			search.delete("s") // type of device that shared the link
+			search.delete("t") // some sort of tracking ID
 
 			search = search.toString()
 			if (search !== "") search = `?${search}`