Duplicate port numbers in openframe_project_wrapper_empty.mag cause short.

[d-m-bailey]

mask_rev[9] and mask_rev[13] both have port 60 in mag/openframe_project_wrapper_empty.mag.
Suggest changing mask_rev[13] to port 56.

flabel metal2 s 607098 -400 607150 56 0 FreeSans 400 90 0 0 mask_rev[9]
port 60 nsew
flabel metal2 s 607322 -400 607374 56 0 FreeSans 400 90 0 0 mask_rev[10]
port 59 nsew
flabel metal2 s 607546 -400 607598 56 0 FreeSans 400 90 0 0 mask_rev[11]
port 58 nsew
flabel metal2 s 607770 -400 607822 56 0 FreeSans 400 90 0 0 mask_rev[12]
port 57 nsew
flabel metal2 s 607994 -400 608046 56 0 FreeSans 400 90 0 0 mask_rev[13]
port 60 nsew

Reported by Xiaochen Ni in xschem slack channel of open-source-silicon.dev