Revert "Update Zulip tests and re-enable (#441)"

This reverts commit 8cf7a67.

Author: auto-submit[bot]

registry/zulip.test registry/zulip.test.disabled

@@ -2,9 +2,7 @@ [email protected]
 [email protected]
 
 fetch=git clone https://github.com/zulip/zulip-flutter.git tests
-fetch=git -C tests checkout 0bfa79d23fc9fcf5ce0cc5a21540434f526838d9
-
-setup.linux=sudo apt install -y libsqlite3-dev
+fetch=git -C tests checkout 28b3536bc81b6665a6014ce72f40c51f83b0c5c4
 
 update=.
 update=packages/zulip_plugin