Fix refuel trucks, add upgraded trucks to array

Issue was:
A. with locality, we were checking the wrong vehicle in one instance and

B. with variable names, since we called local_setFuel and _vehicle was
private already from the calling script we ran into an issue with
duplicate variables causing the command to fail. local_setFuel doesnt
really need any local variable so I removed them and this fixed the
issue (script filters may need to be adjusted accordingly)

SQF/dayz_code/compile/local_setFuel.sqf

@@ -1,3 +1 @@
-_vehicle = _this select 0;
-_qty = _this select 1;
-_vehicle setFuel _qty;
+(_this select 0) setFuel (_this select 1);