Missing correct source formatting.
Fixes issue #142 where TXT/SPF values was previously being forced lowercase, I've now added a conditional check to only force CNAME target addresses to lowercase.  (https://github.com/zpanel/zpanelx/issues/143)
Fixes issue #142 Changed to ensure that ALL other record types are strtolower'd except for TXT and SPF as this made more sense after thinking about it. Needs to be tested but should work perfect!