Change screenOrientation of SignatureActivity to 'userLandscape'

reader/src/main/AndroidManifest.xml

@@ -11,7 +11,7 @@
             android:theme="@style/ReaderActivityNoActionBarNoTitle" />
         <activity
             android:name=".screen.signature.SignatureActivity"
-            android:screenOrientation="landscape"
+            android:screenOrientation="userLandscape"
             android:theme="@style/ReaderActivityNoActionBarNoTitle" />
     </application>