[AUTH-9408] both backslash and brackets needs to be individually escaped

include/tests_authentication

@@ -1393,7 +1393,7 @@
                 LogText "Result: did not find ${ROOTDIR}var/log/tallylog on disk or its file size is zero bytes"
             fi
             # Determine if pam_tally2 is available
-            for D in $(GetReportData --key "pam_module\\[\\]"); do
+            for D in $(GetReportData --key "pam_module\\\[\\\]"); do
                 if ContainsString "pam_tally2" "${D}"; then
                     LogText "Result: found pam_tally2 module on disk"
                     FOUND_PAM_TALLY2=1