Removed error handling of type conversion

Wasn't needed. We don't check for distance == 0, as someone could purposefully push 0 to do a NOP

Author: CoderCatGG

src/kOS.Safe/Compilation/Opcode.cs

@@ -1120,8 +1120,6 @@ public override void Execute(ICpu cpu)
         {
             object popval = cpu.PopValueArgument();
             int distance = Convert.ToInt32(popval);
-            if (distance == null)
-                throw new KOSCastException(popval.GetType(), typeof(ScalarIntValue));
             DeltaInstructionPointer = distance;
         }
     }