Fix zero integer value in options (#802)

Typesense accepts a `0` INT value in some search options parameters like "drop_tokens_threshold": 0. Due to the `array_filter()` function, it was filtered out in the final search query.

src/Engines/TypesenseEngine.php

@@ -190,7 +190,7 @@ public function search(Builder $builder)
     {
         return $this->performSearch(
             $builder,
-            array_filter($this->buildSearchParameters($builder, 1, $builder->limit))
+            $this->buildSearchParameters($builder, 1, $builder->limit)
         );
     }
 
@@ -209,7 +209,7 @@ public function paginate(Builder $builder, $perPage, $page)
     {
         return $this->performSearch(
             $builder,
-            array_filter($this->buildSearchParameters($builder, $page, $perPage))
+            $this->buildSearchParameters($builder, $page, $perPage)
         );
     }