Fix a deadlock w/ SQLite.

sqlite3_shutdown() was called a bit too early, when SQLite-using
threads may still have yet to fully shutdown.

src/main.cc

@@ -1154,10 +1154,10 @@ int main(int argc, char** argv)
 		curl_global_cleanup();
 #endif
 
-		sqlite3_shutdown();
-
 		terminate_bro();
 
+		sqlite3_shutdown();
+
 		// Close files after net_delete(), because net_delete()
 		// might write to connection content files.
 		BroFile::CloseCachedFiles();