Allow all types in GM_setValue

While https://wiki.greasespot.net/GM.setValue still says:
> Strings, booleans, and integers are currently the only allowed data types.

https://sourceforge.net/p/greasemonkey/wiki/GM_setValue/ claims:
> Prior to version 3.2 simple data objects, such as JSON, were not allowed.

And there seem to be scripts actually using those, e.g.:
https://greasyfork.org/en/scripts/394820-mouseover-popup-image-viewer

qutebrowser/javascript/greasemonkey_wrapper.js

@@ -22,11 +22,6 @@
 
     function GM_setValue(key, value) {
         checkKey(key, "GM_setValue");
-        if (typeof value !== "string" &&
-            typeof value !== "number" &&
-            typeof value !== "boolean") {
-          throw new Error(`GM_setValue requires the second parameter to be of type string, number or boolean, not '${typeof value}'`);
-        }
         localStorage.setItem(_qute_script_id + key, value);
     }