Bug 1780137 - Make browser.sessionstore.platform_collection false for Thunderbird. r=calu

Differential Revision: https://phabricator.services.mozilla.com/D153441

modules/libpref/init/StaticPrefList.yaml

@@ -1458,7 +1458,11 @@
 # Platform collection of data for session store
 - name: browser.sessionstore.platform_collection
   type: bool
-  value: @IS_NOT_ANDROID@
+#if defined(ANDROID) || defined(MOZ_THUNDERBIRD)
+  value: false
+#else
+  value: true
+#endif
   mirror: once
 
 # Platform collection of session storage data for session store