Unify the design of add icon in setting

Add icon "+" displayed in APN setting differs from ones in other
settings like VPN settings, SIP accounts etc. Change the icon to
align with others.

Bug: 35936472
Test: Manually check icon display with fix
Change-Id: I99a57fbeb55bb04f911d28e85752ec04edab6f0e
diff --git a/src/com/android/settings/ApnSettings.java b/src/com/android/settings/ApnSettings.java
old mode 100644
new mode 100755
index 3dd772b..38a3155
--- a/src/com/android/settings/ApnSettings.java
+++ b/src/com/android/settings/ApnSettings.java
@@ -337,7 +337,7 @@
             if (mAllowAddingApns) {
                 menu.add(0, MENU_NEW, 0,
                         getResources().getString(R.string.menu_new))
-                        .setIcon(android.R.drawable.ic_menu_add)
+                        .setIcon(R.drawable.ic_menu_add_white)
                         .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
             }
             menu.add(0, MENU_RESTORE, 0,