Use dark theme for alerts if device is in dark mode am: dc23c5ee am:...

Use dark theme for alerts if device is in dark mode am: dc23c5ee am: b9fc508c am: 243beb3d am: 7ce06218

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/1863513

Change-Id: I6ec906cd35884fc2f10c9925a0408b05680b098e