remove 0850f

`browser.urlbar.maxHistoricalSearchSuggestions` is default 0 is FF60 thru to FF66. It is also default 0 in ESR60.1 thru 60.5. (at least on Windows)

IDK if this has ever been used, maybe android, in which case it's probably useful?

user.js

@@ -587,9 +587,6 @@ user_pref("browser.urlbar.speculativeConnect.enabled", false);
 /* 0850e: disable location bar one-off searches [FF51+]
  * [1] https://www.ghacks.net/2016/08/09/firefox-one-off-searches-address-bar/ ***/
    // user_pref("browser.urlbar.oneOffSearches", false);
-/* 0850f: disable location bar suggesting local search history [FF57+]
- * [1] https://bugzilla.mozilla.org/1181644 ***/
-   // user_pref("browser.urlbar.maxHistoricalSearchSuggestions", 0);
 /* 0860: disable search and form history
  * [NOTE] You can clear formdata on exiting Firefox (see 2803)
  * [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history ***/