dselect/update: remove "-f" option as its not being used in the context of apt-get update

dselect/update

@@ -6,7 +6,7 @@ TEXTDOMAIN="apt"
 
 # Get the configuration from /etc/apt/apt.conf
 CLEAN="prompt"
-OPTS="-f"
+OPTS=""
 APTGET="/usr/bin/apt-get"
 APTCACHE="/usr/bin/apt-cache"
 DPKG="/usr/bin/dpkg"