Bug 1637344 - Remove trailing whitespace mistakenly included in new s…

…tring. r=cbrindusan,fluent-reviewers,flod

Differential Revision: https://phabricator.services.mozilla.com/D96821

browser/locales/en-US/browser/preferences/preferences.ftl

@@ -1121,7 +1121,7 @@ content-blocking-section-top-level-description = Trackers follow you around onli
 
 content-blocking-learn-more = Learn more
 
-content-blocking-fpi-incompatibility-warning = You are using First Party Isolation (FPI), which overrides some of { -brand-short-name }’s cookie settings. 
+content-blocking-fpi-incompatibility-warning = You are using First Party Isolation (FPI), which overrides some of { -brand-short-name }’s cookie settings.
 
 ## These strings are used to define the different levels of
 ## Enhanced Tracking Protection.