Remove PlanktoScope v3 config

For 2025.0.0 only. A tester reported it might be confusing

> A Planktoscope v3.0 is already up in the hardware settings dashboard. It can be misleading when users want to select "the latest version"

Author: sonnyp

device-backend/default-configs/v3.0.hardware.json

@@ -1562,11 +1562,6 @@
                 "label": "",
                 "value": "PlanktoScope v2.6",
                 "type": "str"
-            },
-            {
-                "label": "",
-                "value": "PlanktoScope v3.0",
-                "type": "str"
             }
         ],
         "payload": "",
@@ -8244,11 +8239,6 @@
                 "label": "",
                 "value": "PlanktoScope v2.6",
                 "type": "str"
-            },
-            {
-                "label": "",
-                "value": "PlanktoScope v3.0",
-                "type": "str"
             }
         ],
         "payload": "",