Fix delay latency minimum: ubridge rejects latency <= 0

Align validation rules with ubridge source: delay latency must be > 0
(packet_filter.c delay_setup line 182). Update FILTERS definition in
link.py and test cases accordingly.

gns3server/utils/packet_filter_validation.py

@@ -95,7 +95,7 @@ def validate_filter_parameters(filter_type: str, values: List[Any]) -> None:
         },
         "delay": {
             "params_count": 2,  # latency, jitter
-            "ranges": [(0, 32767), (0, 32767)],
+            "ranges": [(1, 32767), (0, 32767)],  # ubridge rejects latency <= 0
             "names": ["Latency", "Jitter"],
             "units": ["ms", "ms"]
         },