fixes#14896ExpandedDB,refresh,plus/minusicon

Signed-off-by: saurass

Description

Fixes #14896 - [QA_4_8] Expanded DB, refresh, plus/minus icon

• In libraries/classes/Navigation/Nodes/Node.php
  -> function getIcon(....) -- is responsible to get b_plus or b_minus icon
  -> in case the node is a group, there was no check and it returned b_plus




• Solution
  -> add a check for group nodes and return b_minus

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