Fix compiled-in /bin/bash in foomatic filters

Foomatic filters contained a 64-char c string hardcoded to /bin/bash.
This caused some filters (at least pdftops) to fail.

I also had to increase the size of the string because nix paths are too
long.

(cherry picked from commit 6a2195c3a5ff2cfb1e5ec0792976cdb609ddb022)
Signed-off-by: Domen Kožar <domen@dev.si>
squish cups patches all into one statement

(cherry picked from commit 139d7f6e1a3aafd79897e0c3997913d412b31308)
Signed-off-by: Domen Kožar <domen@dev.si>