ctdb-tests: Check for readable, not executable, script

Scripts in eventscript unit tests are run under an explicitly
specified shell so they do not need to be executable.  Checking that
the script is executable breaks on scripts that are installed without
the execute bit set, such as disabled eventscripts.

Signed-off-by: Martin Schwenke <martin@meltin.net&g
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#include "config.h"
#include <stdio.h>
#include <stdlib.h>s='footer'>generated by cgit  (git 2.34.1) at 2026-03-29 19:17:51 +0000