Fix incorrect talkback text for non-sfps devices

Set the string id to fingerprint_dialog_touch_sensor for non-sfps
devices.

Bug: 280497338
Test: atest AuthBiometricFingerprintIconControllerTest
Test: 1. open talkback in settings
      2. trigger biometric prompt dialog
      3. move the focus to the fingerprint icon and check the result
Change-Id: I13fff5e119d0366738134e13a95596abba1f0742