propagate the results from ShareExport::intoContainer

this is a fix for an obvious regression. there was some refactoring
going on around here since the 2.4.3 release, and the return value of
ShareExport::intoContainer has since been neglected. with this change
the info banner showing errors/warnings/info/success after exporting a
database tree with KeeShare is shown again.

src/keeshare/ShareObserver.cpp

@@ -288,7 +288,7 @@ QList<ShareObserver::Result> ShareObserver::exportShares()
         const auto& reference = it.value().first();
         const QString resolvedPath = resolvePath(reference.config.path, m_db);
         m_fileWatcher->ignoreFileChanges(resolvedPath);
-        ShareExport::intoContainer(resolvedPath, reference.config, reference.group);
+        results << ShareExport::intoContainer(resolvedPath, reference.config, reference.group);
         m_fileWatcher->observeFileChanges(true);
     }
     return results;