hack: set install profile variable for dev server

on dev.freeform.ca get this error:
Error: Cannot unset string offsets in
/var/www/vhosts/dev.freeform.ca/freeform-profile.dev.freeform.ca/httpdocs/profiles/freeform_base/libraries/profiler/includes/system.inc

setting the install profile won't fix the underlying error on dev but might mitigate it.