message: Fix vehicle rental periods not showing up in vendor listings
  Fixes
diff: #include "Vendors.hpp"
  #include "Rand.hpp"
  +// 7 days
  +#define VEHICLE_EXPIRY_DURATION 604800
  +
  using namespace Vendors;
  std::map<int32_t, std::vector<VendorListing>> Vendors::VendorTables;
  @@ -53,8 +56,8 @@ static void vendorBuy(CNSocket* sock, CNPacketData* data) {
  // if vehicle
  if (req->Item.iType == 10) {
  - // set time limit: current time + 7days
  - req->Item.iTimeLimit = getTimestamp() + 604800;
  + // set time limit: current time + expiry duration
  + req->Item.iTimeLimit = getTimestamp() + VEHICLE_EXPIRY_DURATION;
  }
  if (slot != req->iInvenSlotNum) {
  @@ -224,12 +227,20 @@ static void vendorTable(CNSocket* sock, CNPacketData* data) {
  INITSTRUCT(sP_FE2CL_REP_PC_VENDOR_TABLE_UPDATE_SUCC, resp);
  for (int i = 0; i < (int)listings.size() && i < 20; i++) { // 20 is the max
  - sItemBase base;
  + sItemBase base = {};
  base.iID = listings[i].id;
  - base.iOpt = 0;
  - base.iTimeLimit = 0;
  base.iType = listings[i].type;
  + /*
  + * Set vehicle expiry value.
  + *
  + * Note: sItemBase.iTimeLimit in the context of vendor listings contains
  + * a duration, unlike in most other contexts where it contains the
  + * expiration timestamp.
  + */
  + if (listings[i].type == 10)
  + base.iTimeLimit = VEHICLE_EXPIRY_DURATION;
  +
  sItemVendor vItem;
  vItem.item = base;
  vItem.iSortNum = listings[i].sort;
  