testCanRestoreBackupData: check for non-enterprise/non-Passpoint

Enterprise and Passpoint networks are not backed-up/restored.
Thus, filter them out when picking a network to test.

Bug: 176577105
Test: atest WifiBackupRestoreTest
Change-Id: I62f15d05ebdfe3f98f5680186b9de6e26c5d7e00
Merged-In: I62f15d05ebdfe3f98f5680186b9de6e26c5d7e00