CRM-13981 handling SC on Gift Membership minor fix

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* CRM-13981: Migrate "In Honor of" to Soft Credits
  https://issues.civicrm.org/jira/browse/CRM-13981
Styling and minor changes
Set SC type to Gift by default
Merge pull request #3220 from monishdeb/CRM-13981

CRM-13981 handling SC on Gift Membership minor fix