Change default value for SOFT_AP_TIMEOUT_ENABLED

Change the default value to 1.

Change-Id: I78a69d6224ad417537be59ce51357e1093d6bae4
Fixes: 73501186
Test: RunSettingsRoboTests

tests/robotests/src/com/android/settings/wifi/tether/WifiTetherAutoOffPreferenceControllerTest.java

@@ -81,6 +81,13 @@ public class WifiTetherAutoOffPreferenceControllerTest {
         assertThat(mSwitchPreference.isChecked()).isFalse();
     }
 
+    @Test
+    public void testUpdateState_toggleDefaultOn() {
+        mController.updateState(mSwitchPreference);
+
+        assertThat(mSwitchPreference.isChecked()).isTrue();
+    }
+
     private int getAutoOffSetting() {
         return Settings.Global.getInt(mContext.getContentResolver(),
                 Settings.Global.SOFT_AP_TIMEOUT_ENABLED, OFF);