Fix where() not working

[diezg]

Hi, I was trying to use ->where() after ->search() with no success. The problem was the order of the parameters in the query.
I realized that commenting a line in src/Engines/MySQLEngine.php fixes it.

Example with query Inventory::search('papa')->where('category_id', 97)->get():
Before change:

"query" => "select *, MATCH(name,tags) AGAINST(? IN NATURAL LANGUAGE MODE) as relevance from `inventories` where category_id = ? AND MATCH(name,tags) AGAINST(? IN NATURAL LANGUAGE MODE) and `inventories`.`deleted_at` is null"
 "bindings" => array:3 [
   0 => "papa"
   1 => "papa"
   2 => 97
 ]

After change, bindings are in correct order:

    "query" => "select *, MATCH(name,tags) AGAINST(? IN NATURAL LANGUAGE MODE) as relevance from `inventories` where category_id = ? AND MATCH(name,tags) AGAINST(? IN NATURAL LANGUAGE MODE) and `inventories`.`deleted_at` is null"
    "bindings" => array:3 [
      0 => "papa"
      1 => 97
      2 => "papa"
    ]