shiritori/admin: don't go offline

If we go offline too early: entries will not be saved to Firebase.
For now let's require the user to explicitly kill the import
dictionary script after acknowledging that all entries have been
written.

Change-Id: Ic75099ea4f932a70ffc965e5a8a1f3460e833b4a

Author: proppy

README.md

@@ -19,6 +19,7 @@
 
         npm install scripts/
         node scripts/admin.js food edict2-food.utf8 /path/to/service-account
+        ^C
 
 1. Deploy firebase functions.
 

scripts/admin.js

@@ -91,8 +91,5 @@ fs.readFile(process.argv[3], 'utf8', function (err, data) {
       しりとり[k][word] = kana;
     });
     console.log(JSON.stringify(しりとり));
-    if (admin) {
-      admin.database().goOffline();
-    }
   });
 });