fix(server/mysql): await individual inventory saves

Following up on a recommendation from last year
which was never added. After mismatching netid
checks were added to save, remove, and reload an
inventory it could lead to race conditions on servers
with higher loads.

Likely related to #1963

Author: thelindat

modules/mysql/server.lua

@@ -128,27 +128,27 @@ function db.loadPlayer(identifier)
 end
 
 function db.savePlayer(owner, inventory)
-    return MySQL.prepare(Query.UPDATE_PLAYER, { inventory, owner })
+    return MySQL.prepare.await(Query.UPDATE_PLAYER, { inventory, owner })
 end
 
 function db.saveStash(owner, dbId, inventory)
-    return MySQL.prepare(Query.UPSERT_STASH, { inventory, owner and tostring(owner) or '', dbId })
+    return MySQL.prepare.await(Query.UPSERT_STASH, { inventory, owner and tostring(owner) or '', dbId })
 end
 
 function db.loadStash(owner, name)
     return MySQL.prepare.await(Query.SELECT_STASH, { owner and tostring(owner) or '', name })
 end
 
 function db.saveGlovebox(id, inventory)
-    return MySQL.prepare(Query.UPDATE_GLOVEBOX, { inventory, id })
+    return MySQL.prepare.await(Query.UPDATE_GLOVEBOX, { inventory, id })
 end
 
 function db.loadGlovebox(id)
     return MySQL.prepare.await(Query.SELECT_GLOVEBOX, { id })
 end
 
 function db.saveTrunk(id, inventory)
-    return MySQL.prepare(Query.UPDATE_TRUNK, { inventory, id })
+    return MySQL.prepare.await(Query.UPDATE_TRUNK, { inventory, id })
 end
 
 function db.loadTrunk(id)