Fix broken update request on netbox_location - missing site_id

[nneul]

Currently, a location rename does not function due to missing 'site_id' in the PATCH request. This adds that to the API call.

[nneul]

  ~ update in-place

Terraform will perform the following actions:

  # netbox_location.sjc_nneul will be updated in-place
  ~ resource "netbox_location" "sjc_nneul" {
        id        = "67"
      ~ name      = "NNEUL" -> "NNEUL2"
        tags      = []
        # (3 unchanged attributes hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

netbox_location.sjc_nneul: Modifying... [id=67]
╷
│ Error: [PATCH /dcim/locations/{id}/][400] dcim_locations_partial_update default  map[site:[This field may not be null.]]
│ 
│   with netbox_location.sjc_nneul,
│   on locations.tf line 108, in resource "netbox_location" "sjc_nneul":
│  108: resource "netbox_location" "sjc_nneul" {
│ 
╵

afterwards:

  # netbox_location.sjc_nneul will be updated in-place
  ~ resource "netbox_location" "sjc_nneul" {
        id        = "67"
      ~ name      = "NNEUL" -> "NNEUL2"
        tags      = []
        # (3 unchanged attributes hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

netbox_location.sjc_nneul: Modifying... [id=67]
netbox_location.sjc_nneul: Modifications complete after 0s [id=67]
Releasing state lock. This may take a few moments...

and other variations changing slug and name+slug.

[nneul]

@fbreckle Would you be able to review this for merge?

[fbreckle]

fyi: I added a test to your commit that failed before applying your fix