Change Relation#all to Relation#load [ci skip]

Using `all` method with a `Relation` object is deprecated, so I changed it to `load` method. Original message from rails console:

```
DEPRECATION WARNING: Relation#all is deprecated. If you want to eager-load a relation, 
you can call #load (e.g.`Post.where(published: true).load`). If you want to get an array of 
records from a relation, you can call #to_a (e.g. `Post.where(published: true).to_a`).
```