Merge c73120295a into e6b5e40bb2

This solves multiple issues:
- We don't need `sudo` to check the value anymore
- Some systems may not have `sysctl` available
  - IDK about desktops, but my Debian server doesn't have this command
  (for whatever reason)

dzgui.sh

@@ -406,14 +406,15 @@ check_architecture(){
 }
 check_map_count(){
     [[ $is_steam_deck -gt 0 ]] && return 0
+    local map_count_file="/proc/sys/vm/max_map_count"
     local min_count=1048576
     local conf_file="/etc/sysctl.d/dayz.conf"
     local current_count
-    if [[ ! -f /proc/sys/vm/max_map_count ]]; then
-        logger WARN "File \`/proc/sys/vm/max_map_count\` desn't exist!"
+    if [[ ! -f ${map_count_file} ]]; then
+        logger WARN "File '${map_count_file}' doesn't exist!"
         return 1
     fi
-    current_count=$(cat /proc/sys/vm/max_map_count)
+    current_count=$(cat ${map_count_file})
     if [[ $current_count -ge $min_count ]]; then
         logger DEBUG "System map count is set to ${current_count}"
         return 0