fix: remove unused argument tag

Author: XDRAGON2002

cve_bin_tool/cli.py

@@ -249,11 +249,6 @@ def main(argv=None):
         help="operate in offline mode",
         default=False,
     )
-    parser.add_argument(
-        "--offline",
-        action="store_true",
-        help="operate in offline mode",
-    )
 
     merge_report_group = parser.add_argument_group(
         "Merge Report", "Arguments related to Intermediate and Merged Reports"