uncrustify: Exclude app/flatpak-polkit-agent-text-listener.[ch]

These are copied from polkit so we don't want to uncrustify them.

Closes: flatpak#2715
Approved by: matthiasclasen

uncrustify.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-uncrustify -c uncrustify.cfg --no-backup `git ls-tree --name-only -r HEAD | grep \\\.[ch]$ | grep -v common/valgrind-private.h`
+uncrustify -c uncrustify.cfg --no-backup `git ls-tree --name-only -r HEAD | grep \\\.[ch]$ | grep -v common/valgrind-private.h | grep -v app/flatpak-polkit-agent-text-listener\\\.[ch]`