scripts: Added vestigial -:/--dots flag to plot.py

This just makes it easier to jump between plot.py and plotmpl.py.

scripts/plot.py

@@ -1746,6 +1746,10 @@ if __name__ == "__main__":
             choices=['never', 'always', 'auto'],
             default='auto',
             help="When to use terminal colors. Defaults to 'auto'.")
+    parser.add_argument(
+            '-:', '--dots',
+            action='store_true',
+            help="Use 1x2 ascii dot characters. This is the default.")
     parser.add_argument(
             '-⣿', '--braille',
             action='store_true',