Fix formatting of mac addresses from dhcp discovery mocking in fronius (

#110572)

Co-authored-by: Matthias Alphart <[email protected]>

tests/components/fronius/test_config_flow.py

@@ -39,7 +39,7 @@ def no_setup():
 MOCK_DHCP_DATA = DhcpServiceInfo(
     hostname="fronius",
     ip="10.2.3.4",
-    macaddress="00:03:ac:11:22:33",
+    macaddress="0003ac112233",
 )