Add missing negation in changelog.

debian/changelog

@@ -26,7 +26,7 @@ tails (3.5) unstable; urgency=medium
       persistent Claws Mail setting is enabled, this creates an empty
       ~/.icedove/ directory, that prevents Thunderbird from starting
       (Closes: #12734).
-    - Prevent the GNOME Applications button from opening its menu if
+    - Don't prevent the GNOME Applications button from opening its menu if
       time syncing resulted in a shift back in time (Closes: #14250).
     - Tails Installer: when cloning Tails to another USB drive, check
       if the target device has enough space *before* any destructive