enh: use g_mode to explicitly save/load the current running mode

src/vulns/CVE-2022-40982.sh

@@ -145,7 +145,7 @@ check_CVE_2022_40982_linux() {
         if [ -n "$kernel_gds" ]; then
             pr_info_nol "* Kernel has disabled AVX as a mitigation: "
 
-            if [ "$opt_runtime" = 1 ]; then
+            if [ "$g_mode" = live ]; then
                 # Check dmesg message to see whether AVX has been disabled
                 dmesg_grep 'Microcode update needed! Disabling AVX as mitigation'
                 dmesgret=$?