chore(redm): add FCVAR_PROTECTED flag to redm_version cvar

Added the FCVAR_PROTECTED flag to the redm_version cvar in order to prevent it from being modified by clients. This ensures that the server maintains control over this variable and its value.

[skip ci]

cstrike/addons/amxmodx/scripting/ReDeathmatch.sma

@@ -33,7 +33,7 @@ public plugin_init() {
     register_plugin("ReDeathmatch", REDM_VERSION, "Sergey Shorokhov")
     register_dictionary("redm/redm.txt")
 
-    create_cvar("redm_version", REDM_VERSION, (FCVAR_SERVER|FCVAR_SPONLY))
+    create_cvar("redm_version", REDM_VERSION, (FCVAR_SERVER|FCVAR_SPONLY|FCVAR_PROTECTED))
 
     if (!is_regamedll()) {
         LogMessageEx(Fatal, "^n    ReGameDLL not found!")