[FIX] sap.ui.commons.ColorPicker: Accessability (added tooltips)

- also removed trailing whitespaces

BCP: 1472000541
Change-Id: I1b33364a45b74625d9c4c2479e93f52d25dcf984
Merge "[FIX] sap.ui.commons.ColorPicker: Accessability (added tooltips)"