fix: Correct apply setClickableText, prevent spurious underlines (#5)

The previous code was operating on the wrong text, resulting in normal
URL spans (which have an underline) being applied, instead of the
correct spans (which don't).

Fix this by using the correct length.

app/src/main/java/app/pachli/util/LinkHelper.kt

@@ -68,7 +68,7 @@ fun setClickableText(view: TextView, content: CharSequence, mentions: List<Menti
     val spannableContent = markupHiddenUrls(view.context, content)
 
     view.text = spannableContent.apply {
-        getSpans(0, content.length, URLSpan::class.java).forEach {
+        getSpans(0, spannableContent.length, URLSpan::class.java).forEach {
             setClickableText(it, this, mentions, tags, listener)
         }
     }