Regolden test golden files to fix false diff_files mismatches

Update .libok/.txtok/.sdcok golden files to match current writer
output so diff_files produces "No differences found" instead of
silently reporting mismatches that were captured as expected output.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>

Author: jhkim-pii

liberty/test/liberty_cell_deep.ok

@@ -647,6 +647,4 @@ Timing arcs
   combinational
   ^ -> v
   v -> ^
-Differences found at line 107.
-	cell_rise(Timing_7_7) {
-        cell_rise(Timing_7_7) {
+No differences found.