client: Add tag on blur in source editor

Author: jtojnar

assets/js/templates/Source.jsx

@@ -552,6 +552,7 @@ function SourceEditForm({
                         onDelete={tagsOnDelete}
                         onAddition={tagsOnAddition}
                         allowNew={true}
+                        addOnBlur={true}
                         minQueryLength={1}
                         placeholderText={_('source_tags_placeholder')}
                         removeButtonText={_('source_tag_remove_button_label')}