Initialize the angle attribute of gradients

In Q the default is different...

Fixes: 139778941
Test: manual
Change-Id: I73f69cc634662d5f7641a7d610eb19cb717e9f4b
diff --git a/car-apps-common/res/drawable/background_image_scrim.xml b/car-apps-common/res/drawable/background_image_scrim.xml
index c344a6e..89a8092 100644
--- a/car-apps-common/res/drawable/background_image_scrim.xml
+++ b/car-apps-common/res/drawable/background_image_scrim.xml
@@ -28,6 +28,7 @@
     <item>
         <shape>
             <gradient
+                android:angle="0"
                 android:centerX="0.48"
                 android:startColor="@android:color/transparent"
                 android:centerColor="@android:color/black"
@@ -37,6 +38,7 @@
     <item>
         <shape>
             <gradient
+                android:angle="0"
                 android:centerX="0.38"
                 android:startColor="@android:color/transparent"
                 android:centerColor="#B3000000"