[Plugin: MailChimp] patch to allow setting margin on mc_merg

I meeded to set the margin on mc_merge_var so that I could put a couple pixels separation between the input fields.
On my wordpress installation ?mcsf_action=main_css&ver=3.2.1 is loaded AFTER style.css
This means that any styling in mcsf_action will overwrite my feeble attempts at styling in style.css

Since a new class has margin=0 and padding=0 by default I figure we don’t need to hardcode it in function mailchimpSF_main_css

.mc_merge_var{
     padding:0;
     margin:0;
}

I suggest the core code for the plugin remove those values

.mc_merge_var{
}

This is all found at about line 187 in mailchimp.php

https://www.ads-software.com/extend/plugins/mailchimp/