ad.html: remove the extra lines

_includes/ad.html

@@ -1,5 +1,4 @@
 <detect-missing-adblocker>
-<hr/>
 <span slot="title" class="centered"><p>Dear reader, you may be missing a content blocker! 🙀</p></span>
 <span slot="message" class="centered">
 <noscript><strong><em>Dear JavaScript blocker, please accept my apologies for needlessly showing you this.</em></strong></noscript>
@@ -12,5 +11,4 @@
 <p><a href="https://en.m.wikipedia.org/wiki/Targeted_advertising#Disadvantages">Learn more about targeted advertising!</a>
 <p><small>PS. I am sorry if you are already protected and this silly <a href="https://easylist.to/">EasyList</a> targeting(?) script doesn't detect that, thank you for taking the steps towards a safer internet! 💜</small></p>
 </span>
-<hr/>
 </detect-missing-adblocker>