DolphinView: initialize m_controlWheelAccumulatedDelta

Amol Godbolerequested to merge
amolgodbole/dolphin:fix_initial_ctrl_zoom into master

Ctrl + scroll wheel zoom was not working as designed after Dolphin is launched. Initialize m_controlWheelAccumulatedDelta in DolphinView's constructor.

BUG: 469354

Edited by Amol Godbole

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