Change android:windowSoftInputMode from stateUnchanged to stateHidden

Bug: 158334351
Test: manual
Change-Id: Ib3d9898fe482c1b5a091aee8049c634f401fc277
(cherry picked from commit f6fafde0dab85c56eaa71d57eb39fee64764cc97)
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index bdf7a65..11f0728 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -38,7 +38,7 @@
         <activity
             android:name=".MediaActivity"
             android:resizeableActivity="true"
-            android:windowSoftInputMode="stateUnchanged|adjustPan"
+            android:windowSoftInputMode="stateHidden|adjustPan"
             android:launchMode="singleTop">
             <meta-data android:name="distractionOptimized" android:value="true"/>
         </activity>