Remove erroneous renouncement from NearbyDevicesRenouncePermissionTest.

This removes a renouncement of the BLUETOOTH_SCAN permission that was
included in this test by mistake.

The renouncement does not make a difference to the test result because
the test package does not have the RENOUNCE_PERMISSIONS permission
so PermissionChecker does not apply the renouncement. However this
line should still be removed to avoid confusion.

Bug: 186839041
Test: atest NearbyDevicesRenouncePermissionTest
Change-Id: I6b8cacfcfbac23a1c3e0bf8370e3f63c39f92e02