Fix PR link in changelog for v48.0

See https://wiki.openstreetmap.org/wiki/Talk:StreetComplete/Quests#Fix_Changelog_link_pull_id_to_4440_(instead_of_pull_id_4386)_for_fire_hydrant_ref_quest

Better late than never...

app/src/main/res/raw/changelog.yml

@@ -318,7 +318,7 @@ v48.0: |
   <li><i>How is drinking water provided here?</i> (#4423, #4390), by @matkoniecz</li>
   <li><i>Which direction leads upwards here?</i>, asked for mountainbike tracks (#4385), by @matkoniecz</li>
   <li><i>What’s the identification number here?</i>, asked for emergency access points (#4384, #4386), by @mcliquid</li>
-  <li><i>What’s the identification number here?</i>, asked for fire hydrants (#3059, #4386), by @mcliquid</li>
+  <li><i>What’s the identification number here?</i>, asked for fire hydrants (#3059, #4440), by @mcliquid</li>
   <li><i>Can this cycle barrier be opened?</i> (#4293, #4406), by @mnalis</li>
   </ul>
   <h3>Enhanced Quests</h3>