Issue #2848296 by csakiistvan, RenatoG: Wrong template name in the field collection item

 *   preprocess functions. By default the following classes are available, where

 *   the parts enclosed by {} are replaced by the appropriate values:

 *   - entity-field-collection-item

 *   - field-collection-item-{field_name}

 *   - field-collection-item--{field_name}

 *

 * Other variables:

 * - $classes_array: Array of html class attribute values. It is flattened