Revert "Update "Open networks available" toggle to instead open notification channel preferences."

This reverts commit 2c4b42c0b7a227ed78a1ac89600deb7d6eadfd3b.

Reason for revert: Need to use Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON to toggle the feature because system NotificationChannels cannot be disabled.
Bug: 37794067
Test: m RunSettingsRoboTests

Change-Id: I6aaad78686f4fe929fd6bcd94897341fdaf6bd23
5 files changed