Fix formatting of mac addresses from dhcp discovery mocking in screenlogic (#110602)

dhcp returns addresses in lowercase without :

tests/components/screenlogic/test_config_flow.py

@@ -133,7 +133,7 @@ async def test_dhcp(hass: HomeAssistant) -> None:
         data=dhcp.DhcpServiceInfo(
             hostname="Pentair: 01-01-01",
             ip="1.1.1.1",
-            macaddress="AA:BB:CC:DD:EE:FF",
+            macaddress="aabbccddeeff",
         ),
     )