Fix dark navigationBar background in some telephony settings pages

Style changes:

- Organize styles.xml, make Theme.Telecom.DialerSettings as a base settings theme, and declare navigationBarColor transparent.

- Align EnableAccount\BlockedNumbers\CallSettingsWithoutDividerTheme extending this base settings theme.

Affected pages:
EnableAccountPreferenceActivity\RespondViaSmsSettings\BlockedNumbersActivity

Bug: b/253168764 b/236809093
Test: Manual UI test in normal and dark mode

Change-Id: Iced178b2edfeb5a6f8d2bb6048b353e38981fb97