reduced sizes of gas zkASM columns

Author: lorenzogentile404

gas/gas.zkasm

@@ -4,8 +4,8 @@
 ;; "Out Of Gas Exception".  When OOGX==1, it means the corresponding
 ;; instruction generated an out-of-gas exception (rather than some
 ;; other exception kind).
-pub fn gas(GAS_COST u64, GAS_ACTUAL u64, XAHOY u1, OOGX u1) {
-  var tmp u64
+pub fn gas(GAS_COST u32, GAS_ACTUAL u32, XAHOY u1, OOGX u1) {
+  var tmp u32
   var b u1
   ;;
   b, tmp = GAS_ACTUAL - GAS_COST