Fix awk positional specifiers. Close #2

Fixes an error while compiling in Ubuntu 18.04/19.10:

    awk: run time error: improper conversion(number 1) in printf("%1$s/%2$s.apk
    %1$s/%2$s/%2$s.apk
    ")

I'm not sure about the solution. I can't find any documentation with this syntax, or why it changed, so it can probably break at some point. But it works on Debian 10 right now, so it seems to be backward compatible.

build-zip.sh

@@ -120,7 +120,7 @@ apps_config | xargs -l bash -c 'download_app $@' -
 
 echo "~~~ Making OTA survival script"
 cat templates/addond-head > $ADDOND_FILE
-apps_config | awk '{sub("/system/", "", $4); printf "%1$s/%2$s.apk\n%1$s/%2$s/%2$s.apk\n", $4, $3}' >> $ADDOND_FILE
+apps_config | awk '{sub("/system/", "", $4); printf "$1/$2.apk\n$1/$2/$2.apk\n", $4, $3}' >> $ADDOND_FILE
 cat templates/addond-tail >> $ADDOND_FILE
 
 echo "~~~ Packing up"