Can't display multiple checkboxes in xprofile fields

[ptahdunbar]

When creating a multi-checkbox field in BuddyPress, it only displays the first option.

This is due to a $count variable resetting the parent $count value within a nested for loop in bp_get_the_profile_field_options().

Patch creates a unique name for the nested count variable, fixes the bug so it actually displays all the fields.

[DJPaul]

Confirmed, thanks for the patch

[djpaul]

(In [4975]) Fix display of multiple checkboxes in profile fields. Fixes #3478, props ptahdunbar