Update desktop-app-changelog.md

Author: amyblais

source/product-overview/desktop-app-changelog.md

@@ -56,6 +56,7 @@ This changelog summarizes updates to Mattermost desktop app releases for [Matter
 #### Windows
 
 - Fixed an issue where installing over top of an old Desktop App on Windows could break the shortcut. NOTE: You may need to remake your shortcut in the taskbar once after this change [MM-63779](https://mattermost.atlassian.net/browse/MM-63779).
+- Fixed an issue where the notification badge on Windows could get out of sync.
 
 #### All Platforms