[lyon] Remove switch-ib occurence from pdus outlets

data/grid5000/sites/lyon/pdus/pdu3b.json

@@ -17,7 +17,6 @@
     "b8": "sirius-1",
     "c1": "pyxis-1",
     "c2": "pyxis-2",
-    "c3": "switch-ib",
     "c4": "gemini-2",
     "c5": "gemini-1",
     "c8": "sirius-1"

input/grid5000/sites/lyon/pdus.yaml

@@ -285,7 +285,6 @@ pdus:
         channel: 6
         phase: 3
         phase_inverted: false
-      c3: switch-ib
       c4:
         uid: gemini-2
         wattmetre: wattmetrev3-1