Fixed the color for Drawer Quota + fixed a global bug about color

Signed-off-by: Kilian Périsset <kilian.perisset@infomaniak.com>

src/main/java/com/owncloud/android/ui/activity/DrawerActivity.java

@@ -137,6 +137,11 @@ public abstract class DrawerActivity extends ToolbarActivity
      */
     private NavigationView mNavigationView;
 
+    /**
+     * Reference to the navigation view header.
+     */
+    private View mNavigationViewHeader;
+
     /**
      * Flag to signal if the account chooser is active.
      */
@@ -198,8 +203,8 @@ public abstract class DrawerActivity extends ToolbarActivity
         if (mNavigationView != null) {
 
             // Setting up drawer header
-            View navigationHeader = mNavigationView.getHeaderView(0);
-            FrameLayout drawerHeader = navigationHeader.findViewById(R.id.drawer_header_view);
+            mNavigationViewHeader = mNavigationView.getHeaderView(0);
+            FrameLayout drawerHeader = mNavigationViewHeader.findViewById(R.id.drawer_header_view);
             setupDrawerHeader(drawerHeader);
 
             setupDrawerMenu(mNavigationView);

src/main/res/layout/drawer.xml

@@ -38,7 +38,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_gravity="bottom"
-            android:background="@color/bg_default"
+            android:background="@color/appbar"
             android:clickable="false"
             android:orientation="vertical"
             android:paddingLeft="@dimen/standard_padding"