Make Launcher activity restart on density change

- Launcher used to restart when density changes before http://ag/14234761, which added smallestScreenSize and density in configChange
- http://ag/14234761 aims to avoid restart when switching display in split dispalys, for which only size changes, therefore density is unnecessary in configChange
- Keeping density in configChange make Launcher acitvity to stay after changing display size, making all buttons stays in old size in previous denstiy, which is a bug

Bug: 204157738
Test: manual
Change-Id: Ib85326078c67c35d90dc5e9ae5c20eeb5286a610
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index c72f62d..b838a51 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -50,7 +50,7 @@
             android:stateNotNeeded="true"
             android:windowSoftInputMode="adjustPan"
             android:screenOrientation="unspecified"
-            android:configChanges="keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenSize|screenLayout|smallestScreenSize|density"
+            android:configChanges="keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenSize|screenLayout|smallestScreenSize"
             android:resizeableActivity="true"
             android:resumeWhilePausing="true"
             android:taskAffinity=""