scripts: Adopted -c for --cat shortform

This avoids conflicts with -z/--depth, which will likely be an issue for
dbgbmap.py.

scripts/codemap.py

@@ -1523,7 +1523,7 @@ if __name__ == "__main__":
             action='store_true',
             help="Show the first n lines.")
     parser.add_argument(
-            '-z', '--cat',
+            '-c', '--cat',
             action='store_true',
             help="Pipe directly to stdout.")
     parser.add_argument(