WheelHandler: remove std::clamp assert crash, only process ScrollView keyboard events

Noah Davisrequested to merge
work/ndavis/wheelhandler-fixups into master

WheelHandler: remove std::clamp assert crash

BUG: 503703

WheelHandler: Only apply scrollview event filtering to keys

Matches Qt Quick ScrollView behavior a bit more closely since ScrollView only directly handles arrow key events.

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