Don't try to disable ASLR

We don't need to disable ASLR, so don't try. If gdb tries but fails,
the test runs normally, but all.sh then trips up because it sees
`warning: Error disabling address space randomization: Operation not permitted`
and interprets it as an error that indicates a test failure.
diff --git a/tests/scripts/test_zeroize.gdb b/tests/scripts/test_zeroize.gdb
index 617ab55..77c812a 100644
--- a/tests/scripts/test_zeroize.gdb
+++ b/tests/scripts/test_zeroize.gdb
@@ -41,6 +41,9 @@
 # number does not need to be updated often.
 
 set confirm off
+# We don't need to turn off ASLR, so don't try.
+set disable-randomization off
+
 file ./programs/test/zeroize
 break zeroize.c:100