Use customizations instead of default for chromium settings

Author: ayufan

package/root/etc/chromium-browser/default renamed to package/root/etc/chromium-browser/customizations/pine64-optimisations

@@ -1,8 +1,5 @@
-# Default settings for chromium-browser. This file is sourced by /bin/sh from
-# /usr/bin/chromium-browser
-
 # Options to pass to chromium-browser
-CHROMIUM_FLAGS="\
+CHROMIUM_FLAGS="$CHROMIUM_FLAGS \
 --disable-smooth-scrolling \
 --disable-low-res-tiling \
 --enable-low-end-device-mode \