[AUTH-9408] double escape to prevent error message (awk: warning: escape sequence '\[' treated as plain '[')

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