Fix ble stop scan crash when BT is not turned on

Need to check if BT is one before stop ble scan

Test: atest CtsCompanionDeviceManagerCoreTestCases
      atest CtsCompanionDeviceManagerUiAutomationTestCases
      atest CtsOsTestCases:CompanionDeviceManagerTest
Bug: 219684162
Change-Id: Ib257923e7c63e2fcd76ef9791adc77d70fee5de9
1 file changed