Disable Elements unblinding in the server-side rendering environment (#466)

Attempting to access the URL hash fragment (`location.hash`) on the
server-side was causing an error, because it is not available there.

Unblinding should only be done on the client-side for privacy reasons
anyway, so this feature can be disabled entirely on the server-side.

Author: shesek

client/src/app.js

@@ -58,7 +58,7 @@ export default function main({ DOM, HTTP, route, storage, scanner: scan$, search
     , sort_dir: loc.query.sort_dir != null ? loc.query.sort_dir : 'asc'
     , limit: +loc.query.limit || 50,
     }))
-  , blindingReq$ = !process.env.IS_ELEMENTS ? O.empty()
+  , blindingReq$ = !(process.env.IS_ELEMENTS && process.browser) ? O.empty()
       : page$.map(loc => loc.hash.startsWith('#blinded=') ? loc.hash.substr(9) : null)
   // End Elements only