Dismiss dialogs properly on closing.

Also make the invisible activity truly invisible (was
showing a blue line behind the dialog).

Bug: 5572140
Change-Id: I67b31f0682f189c7075011e0dd0660b0fbc543d9
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 649e06c..68aca79 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -494,7 +494,7 @@
 
         <activity android:name="SettingsLicenseActivity"
                 android:label="@string/settings_license_activity_title"
-                android:theme="@*android:style/Theme.Holo.Dialog.Alert"
+                android:theme="@android:style/Theme.Holo.Panel"
                 android:configChanges="orientation|screenSize">
             <intent-filter>
                 <action android:name="android.settings.LICENSE" />