[WifiBaseTest]Correcting condition to raise AP value error.

Bug: 111500771
Bug: 111502276
Test: Local
Change-Id: I6af55fe0faffbfa7726d4439d32972ca8f92769d
diff --git a/acts/framework/acts/test_utils/wifi/WifiBaseTest.py b/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
index 010e26d..1f69270 100755
--- a/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
+++ b/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
@@ -261,8 +261,10 @@
         config_count = 1
         count = 0
 
-        if mirror_ap and ap_count == 1:
-             raise ValueError("ap_count cannot be 1 if mirror_ap is True.")
+        # For example, the NetworkSelector tests use 2 APs and require that
+        # both APs are not mirrored.
+        if not mirror_ap and ap_count == 1:
+             raise ValueError("ap_count cannot be 1 if mirror_ap is False.")
 
         if not mirror_ap:
             config_count = ap_count