Remove setWifiEnabled from CTS Multinetwork test

Test: Verified on a Pixel 2 running Android 10
Change-Id: I5a81b0c7b1e436ed0526d442a31c301fc0e10734
(cherry picked from commit aba20b47dfa9b1f9736829d24e8d4c13c16ccc79)
2 files changed