Antony Sargent b81953228c Remove reference to preference_category_material_settings
This layout in settingslib has been migrated to the support library's
preference_category_material, so we can just reference that.

Bug: 110037570
Test: manual (format of category headers should look normal in Settings
timezone picker)

Change-Id: I32df326e1d4afd4d7ae6f694c38554f3d0f54e84
2018-06-13 10:35:24 -07:00
2018-04-20 12:52:29 -07:00
2015-04-13 09:21:39 -07:00
2017-10-13 15:59:03 -07:00
2018-04-20 12:52:29 -07:00
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