fix sequence init

Author: nekufa

src/Space.php

@@ -225,7 +225,7 @@ public function findOrCreate(array $query, ?array $data = null)
             end
             if tuple[id_key] == 0 then
                 if box.sequence[space] == nil then
-                    box.sequence.create(space)
+                    box.schema.sequence.create(space)
                 end
                 tuple[id_key] = box.sequence[space]:next()
             end

tests/MapperTest.php

@@ -380,7 +380,7 @@ public function testFindOrCreateRow()
         $secondRow = $tester->findOrCreate(['nick' => 'Jimmy'], ['idle' => 0]);
         $findRow = $tester->findOrCreate(['nick' => 'Billy']);
         $result = $mapper->client->evaluate("return box.space.tester.index.nick:select('Jimmy')")[0];
-        $this->assertTrue($result[0][1] == 0);
+        $this->assertTrue($result[0][0] == 0);
         $this->assertSame($secondRow->id, $result[0][1]);
         $this->assertEquals($firstRow, $findRow);
         $tester->drop();