Revert "Add divider line in Preference for scan QR code button and share hotspot button"

This reverts commit 890f3a4340b2cbbe1e82337005383f7a33ddd948.

Reason for revert: I find a UI defect in this fix.

Change-Id: Icdbb1d2b5319636b8c4c54bcdc0fc3562585a15a
3 files changed