allow ViewSelector to show icon only when the window is small

Summary:
When the elisa window is small, ViewSelector only show icons and
the entry text is shown only via a tooltip

CCBUG: 392778

T9640

Test Plan: allow to start to fix issues when quarter tiled

Reviewers: ngraham, astippich, januz

Reviewed By: astippich

Differential Revision: https://phabricator.kde.org/D15308