Default Aosp lockscreen - black area on JB

Hi.. we know that, to revert to original aosp lockscreen on xperia JB 4.1.2.. we need to delete the lockscreen apk in system.
I'm using xperia TL, with xperiment 3.5.. i know how to decompile apk.
Does someone know how to make the lockscreen full? I've attached my screenshot, there is a black area at the bottom.how can I remove that? Thanks.

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