Update uW antenna metric

./designs/sky130hd/microwatt/
| Metric                                        | Old      | New      | Type     |
| ------                                        | ---      | ---      | ----     |
| detailedroute__antenna__violating__nets       |        0 |        1 | Failing  |

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/designs/sky130hd/microwatt/rules-base.json

@@ -40,7 +40,7 @@
         "compare": "<="
     },
     "detailedroute__antenna__violating__nets": {
-        "value": 0,
+        "value": 1,
         "compare": "<="
     },
     "detailedroute__antenna_diodes_count": {