Set keyguardPreviewRenderer large clock margin to real large clock margin

Make these the same values.

Ideally these would target the same variable, however
to minimize risk I'm just changing it this way for now.

Bug: 415323661
Test: manual
Flag: com.android.systemui.shared.clock_reactive_smartspace_layout
Change-Id: I4d76b508e57d329f7963aae26fc3a6849c4f36c0