xprofile field delete does not delete field meta

[shanebp]

It seems that when you delete an instance of an xprofile field, associated data in the bp_xprofile_meta table is not deleted.

There is this function bp_xprofile_delete_meta in bp-xprofile-functions.php. But it isn't called when a field instance is deleted, afaik.
And it only takes a single object_type - but there may be meta data of more than one object_type.

So I think another function is needed. And a call to that function.

[dontdream]

Related to #6658

[DJPaul]

Yep, let's use the existing ticket to track this issue. Thanks for reporting the bug @dontdream!