Merge pull request 'improve script' (#32) from mark22k/crxn-entitydb:maxlen-script into master

Reviewed-on: https://codeberg.org/CRXN/entitydb/pulls/32

build_maxlen_filter.sh

@@ -23,7 +23,7 @@ for file in *.json; do
         if [ "$1" == "bird" ]; then
             filter="$filter$prefix{$prefixlen,$maxlen},\n"
         elif [ "$1" == "babeld" ]; then
-            filter="$filter \bin ip $prefix ge $maxlen allow\n"
+            filter="${filter}in ip $prefix ge $maxlen allow\n"
         fi
     done
 done