🔥 Remove unused locale key

Author: trickypr

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

@@ -1,8 +1,8 @@
 diff --git a/browser/locales/en-US/browser/preferences/preferences.ftl b/browser/locales/en-US/browser/preferences/preferences.ftl
-index d7b87eacb425cb277e226261c7d994e084100a5d..fb2a3d6f1c1c37673f7e58a785e96e8c9b246c14 100644
+index d7b87eacb425cb277e226261c7d994e084100a5d..277547d122293ade9a6dd9c41640f62a1adc1e16 100644
 --- a/browser/locales/en-US/browser/preferences/preferences.ftl
 +++ b/browser/locales/en-US/browser/preferences/preferences.ftl
-@@ -1424,3 +1424,12 @@ httpsonly-radio-disabled =
+@@ -1424,3 +1424,11 @@ httpsonly-radio-disabled =
  desktop-folder-name = Desktop
  downloads-folder-name = Downloads
  choose-download-folder-title = Choose Download Folder:
@@ -12,6 +12,5 @@ index d7b87eacb425cb277e226261c7d994e084100a5d..fb2a3d6f1c1c37673f7e58a785e96e8c
 +preferences-sidebar-visible =
 +    .label = Show sidebar tabs
 +
-+preferences-vertical-tabs-header = Vertical Tabs
 +preferences-vertical-tabs-enabled =
 +    .label = Use vertical tabs (Early Access)