Add $network_id parameter to filters in `get_network_option()`

[flixos90]

I just noticed that the filters in get_network_option() do not receive the network ID passed to the function. This makes these filters useless for quite a few use-cases (for example when overriding the process of receiving a specific option via pre_site_option_{$option}).

The network ID should be added as a parameter to all these filters.

I will open similar tickets for the filters and actions in add_network_option(), update_network_option() and delete_network_option().

[flixos90]

38319.diff​ introduces the $network_id parameter to the filters in get_network_option().

[jeremyfelt]

Good catch. When we moved from get_site_option() to get_network_option() we made it possible to retrieve options from other networks, not just the current network.

Thanks @flixos90.

Related #38320, #38321, #38322.

[jeremyfelt]

In 38815:

Multisite: Add $network_id parameter to filters in get_network_option().

Props flixos90.
Fixes #38319.

[desrosj]

Linking the dev note that was published here for reference: ​https://make.wordpress.org/core/2016/11/04/multisite-focused-changes-in-4-7/