Fix issue where multiline validation messages were getting clipped.

# Changes
- Fixes an issue where multiline validation messages were getting clipped. Specifically, suggestions (such as email misspellings or address validation) where we don't have any control over length of string. Fixes [DS-414](https://jira.dosomething.org/browse/DS-414).

For review: @DoSomething/front-end 
does the $fieldLabel contain margin/padding/border, etc?  ```outerHeight()``` might be useful