Add the name of the group to the results for browser extensions

Fixes #466

So it can be displayed in the autocomplete list when more than
one login matches. For users that use groups and have similar names
for multiple logins but organized in different groups

src/browser/BrowserService.cpp

@@ -859,6 +859,7 @@ QJsonObject BrowserService::prepareEntry(const Entry* entry)
     res["password"] = entry->resolveMultiplePlaceholders(entry->password());
     res["name"] = entry->resolveMultiplePlaceholders(entry->title());
     res["uuid"] = entry->resolveMultiplePlaceholders(entry->uuidToHex());
+    res["group"] = entry->resolveMultiplePlaceholders(entry->group()->name());
 
     if (entry->hasTotp()) {
         res["totp"] = entry->totp();