Tests: remove deleted switch from essentials purifier

tests/devices/test_essentials_purifier.py

@@ -96,10 +96,6 @@ class TestEssentialsPurifier(
         )
         self.setUpMultiSwitch(
             [
-                {
-                    "dps": SWITCH_DP,
-                    "name": "switch",
-                },
                 {
                     "dps": UV_DP,
                     "name": "switch_uv_sterilization",