Too many arguments passed to prepare() during multisite load

[jeremyfelt]

One of the queries that may be used to set $current_site in wpmu_current_site() passes too many arguments to the prepare() statement building the query. Because path in the query is set to /, there is no need to pass a $path argument.

This has been here since [12787] and looks like it may be an accidental match of the query right above it, which does need the 3 arguments. The additional argument doesn't cause any errors, just a little confusion when reading through the code.

[nacin]

In 27076:

Remove an unnecessary variable passed to wpdb::prepare() during multisite load.

props jeremyfelt.
fixes #26941.