Fix toolbar color un darkmode

Signed-off-by: Joris Bodin <joris.bodin@infomaniak.com>

src/main/res/layout/toolbar_standard.xml

@@ -56,6 +56,7 @@
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            android:background="@color/appbar"
             app:popupTheme="@style/Theme.AppCompat.DayNight.NoActionBar" />
 
     </RelativeLayout>