Bug 1863449 - Port bug 1717068 - Package summary of last_modified of RemoteSettings dumps. r=rjl

Differential Revision: https://phabricator.services.mozilla.com/D192939

--HG--
extra : rebase_source : b75bfbf3cbbc549379f50e89049654caa932819b
extra : amend_source : 7f2d7111371d8a43ba5045c0a81559f6b56a047c

mail/installer/package-manifest.in

@@ -281,6 +281,7 @@
 @RESPATH@/greprefs.js
 
 ; Remote Settings JSON dumps
+@RESPATH@/defaults/settings/last_modified.json
 @RESPATH@/defaults/settings/blocklists
 @RESPATH@/defaults/settings/main
 @RESPATH@/defaults/settings/security-state