Review, fix DRC violation on metal2

Layout/magic/T7_RO51_INV.mag

 magic
 tech scmos
-timestamp 1538566008
+timestamp 1543212938
 << metal1 >>
 rect -310 114 0 118
 rect 424 114 728 118
@@ -16,7 +16,7 @@ rect -310 0 0 4
 rect 424 0 728 4
 << metal2 >>
 rect -6 28 -2 123
-rect 410 97 414 126
+rect 410 98 414 126
 rect 10 86 14 94
 rect 26 86 30 94
 rect 42 86 46 94