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QTabBar: Improve scrolling with high resolution mouse wheels

The current behavior for handling the angle delta of a wheel event changes index the instant there is a change in angle delta. This works fine for mouse wheels that send events with 120 angle delta units and there is also already behavior defined for devices with pixel deltas, but there is nothing good for handling events from high resolution mouse wheels that don't have pixel deltas.

This patch makes it so that the current index doesn't change until the accumulated angle delta for the X or Y axis reaches 120.

[ChangeLog][QtWidgets][QTabBar] Scrolling with a high resolution mouse wheel changes the current index at a rate more like a normal mouse wheel.

Task-number: QTBUG-97844 Pick-to: 6.3 Change-Id: I2e7fd88984a253f6ef8a0008deb7233e4cb4d84a Reviewed-by: Shawn Rutledge (cherry-picked from commit f0371487)

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