Don't use vector assets for notification icon.

app/src/main/res/drawable/ic_notification.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-  <path
-      android:pathData="M3,16.2a9.4,9.4 0,0 1,-0.65 -1.77l1,-0.25A8.83,8.83 0,0 0,4 16.1l-0.33,1.62 -1,-0.2ZM5.43,20.51L3,21l0.49,-2.39 -1,-0.19L2,20.8a1,1 0,0 0,0.25 0.93A1,1 0,0 0,3 22l0.24,0 2.39,-0.49ZM7.9,20l-1.62,0.33 0.2,1L7.81,21a9.06,9.06 0,0 0,1.76 0.65l0.25,-1A8.83,8.83 0,0 1,7.9 20ZM3.43,6.86A10.07,10.07 0,0 0,2.31 9.57l1,0.25a9,9 0,0 1,1 -2.44ZM6.86,3.43l0.52,0.86a9,9 0,0 1,2.44 -1l-0.25,-1A10.07,10.07 0,0 0,6.86 3.43ZM14.43,2.31 L14.18,3.31a9,9 0,0 1,2.44 1l0.52,-0.86A10.07,10.07 0,0 0,14.43 2.31ZM17.14,20.57 L16.62,19.71a9,9 0,0 1,-2.44 1l0.25,1A10.07,10.07 0,0 0,17.14 20.57ZM21,12a8.2,8.2 0,0 1,-0.11 1.32l1,0.15A10.17,10.17 0,0 0,22 12a10.17,10.17 0,0 0,-0.12 -1.47l-1,0.15A8.2,8.2 0,0 1,21 12ZM3,12a8.2,8.2 0,0 1,0.11 -1.32l-1,-0.15A10.17,10.17 0,0 0,2 12a10.17,10.17 0,0 0,0.12 1.47l1,-0.15A8.2,8.2 0,0 1,3 12ZM10.68,3.11a8,8 0,0 1,2.64 0l0.15,-1A10.17,10.17 0,0 0,12 2a10.17,10.17 0,0 0,-1.47 0.12ZM13.32,20.89a8,8 0,0 1,-2.64 0l-0.15,1A10.17,10.17 0,0 0,12 22a10.17,10.17 0,0 0,1.47 -0.12ZM20.57,6.89 L19.71,7.41a9,9 0,0 1,1 2.44l1,-0.25A10.07,10.07 0,0 0,20.57 6.86ZM19.22,17.35a8.73,8.73 0,0 1,-1.87 1.87l0.6,0.8A9.67,9.67 0,0 0,20 18ZM21.69,14.43 L20.69,14.18a9,9 0,0 1,-1 2.44l0.86,0.52A10.07,10.07 0,0 0,21.69 14.43ZM17.35,4.78a8.73,8.73 0,0 1,1.87 1.87l0.8,-0.6A9.67,9.67 0,0 0,18 4ZM4.78,6.65A8.73,8.73 0,0 1,6.65 4.78L6.05,4A9.67,9.67 0,0 0,4 6.05ZM12,4A8,8 0,0 0,5 15.91l-0.78,3.84L8.09,19A8,8 0,1 0,12 4Z"
-      android:fillColor="#ffffff"/>
-</vector>