This reverts commit 53a4963.

This reverts the NotificationsSettingsActivity.java part of commit
53a4963.

This simple implementation only triggers the networks to resume when an
event is received, so Telegram can get the events by itself.

This is not like the other push providers where the change information
is processed by PushListenerController directly, but it still saves battery
since the process disconnects from Telegram servers as soon as the
updates are processed.

As suggested by @p1gp1g

Since android-connector is built with Java 17 some other build system
modifications were needed.

This also means ./gradlew must be called using Java 17+.