[CTS]It should be more reasonable to use setBatterySaverMode API to leave power-save mode instead of plugging in charger for "CtsHostsideNetworkTests" test case.

Symptom: It should be more reasonable to use setBatterySaverMode API to leave power-save mode instead of plugging in charger for "CtsHostsideNetworkTests" test case.
Root Cause: It uses setBatterySaverMode API to enter power-save mode and uses plugging in charger to leave power save mode.It should be more reasonable to use setBatterySaverMode API to leave power-save mode instead of plugging in charger.
Solution: To use setBatterySaverMode API to leave power-save mode instead of plugging in charger.
Project: N70
Note: NA
Test done by RD:
Futher testing need Q team's support:

Change-Id: I491c5d0675f340e1c9911b84e41f034663b1454d
diff --git a/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractAppIdleTestCase.java b/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractAppIdleTestCase.java
index 79435f1..831b387 100644
--- a/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractAppIdleTestCase.java
+++ b/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractAppIdleTestCase.java
@@ -147,6 +147,8 @@
         assertBackgroundNetworkAccess(true);
         setBatterySaverMode(true);
         assertBackgroundNetworkAccess(false);
+        // Use setBatterySaverMode API to leave power-save mode instead of plugging in charger
+        setBatterySaverMode(false);
         turnBatteryOn();
         assertBackgroundNetworkAccess(true);