CMS-3133 Input Type Textline - Adjustments when used in "multiple" mode

Updated `remove` icon: it will be the same size, as in combobox
elements.
Reduced space between `Add` button and input elements in multiple mode.
Merge pull request #638 from enonic/CMS-3133

CMS-3133 Input Type Textline - Adjustments when used in "multiple" mode