Do not clear scores during stopTracking.

Bug: b/63034725
Test: runtest --path
frameworks/base/packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/WifiTrackerTest.java

Change-Id: Ic15c7f42ec9a3883e8ba34194d9a9410457e4399
(cherry picked from commit 4bb84116636b51bf6925580df569fdeedf6061ae)
2 files changed