luci-app-mwan3: remove uci-defaults for ucitrack handling

The 'ucitrack' file is not available anymore this changes are not needed.
Therefore, this 'uci-defaults' script is deleted.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

applications/luci-app-mwan3/root/etc/uci-defaults/60_luci-mwan3

@@ -1,11 +1,5 @@
 #!/bin/sh
 
-# remove existing mwan ucitrack entry is now done with procd
-uci -q batch <<-EOF >/dev/null
-	del ucitrack.@mwan3[-1]
-	commit ucitrack
-EOF
-
 uci -q get mwan3.globals >/dev/null || {
 	uci -q add mwan3 globals >/dev/null
 	uci -q rename mwan3.@globals[-1]="globals" >/dev/null