Angela Wang 14b419b100 Refactor for better readability of using different Bluetooth scanning
We rely on using `filter` is null or not to determine which type of
Bluetooth scanning method is going to be used (Classic of LE). Add a
variable to clearly indicate current scan type for better readibility.

Bug:289189853
Test: make RunSettingsRoboTests ROBOTEST_FILTER=DeviceListPreferenceFragmentTest
Change-Id: I85a26d61410367bd617a0194ba3bfe7ed1b03356
2023-07-19 10:11:08 +00:00
2022-04-14 09:55:36 +00:00
2019-04-04 12:49:15 -07:00
2020-01-16 06:45:18 +00:00
2022-10-06 09:10:38 -07:00
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