Fix amx_gag command argument handling

- Added arg_cmd to enum and marked as unused
- Changed argument count comparison from >= to > to fix validation

Author: Nord1cWarr1or

cstrike/addons/amxmodx/scripting/ChatAdditions/CA_Gag.sma

@@ -1154,15 +1154,16 @@ public ClCmd_EnterGagTime(const id, const level, const cid) {
 }
 
 public ConCmd_amx_gag(const id, const level, const cid) {
-    enum amx_gag_s { /* arg_cmd, */ arg_player = 1, arg_reason, arg_time, arg_flags }
+    enum amx_gag_s { arg_cmd, arg_player, arg_reason, arg_time, arg_flags }
+    #pragma unused arg_cmd
 
     if (!cmd_access(id, level, cid, 1)) {
         return PLUGIN_HANDLED
     }
 
     new argc = read_argc()
 
-    if (argc == 1 || argc >= _: amx_gag_s) {
+    if (argc == 1 || argc > _: amx_gag_s) {
         console_print(id, "^t Wrong arguments count: `%i`", argc)
         console_print(id, "^t Usage: amx_gag ^"[nickname | STEAM_ID | userID | IP]^" ^"<reason>^" <time> <flags>^n")