Fix wrong buffer index on emitting wheel event #268

Job	Run time
list-projects	14s
run-commands (./namui/namui-hooks)	4m 21s
run-commands (./namui/namui)	4m 59s
run-commands (./namui/skia)	4m 13s
run-commands (./namui/namui-drawer)	4m 19s
run-commands (./namui/sample/rect)	5m 3s
run-commands (./namui/sample/register-font)	5m 12s
run-commands (./namui/sample/http)	5m 13s
run-commands (./namui/sample/kv_store)	5m 7s
run-commands (./namui/sample/mouse)	5m 2s
run-commands (./namui/sample/typography-effect)	5m 29s
run-commands (./namui/sample/bundle)	5m 19s
run-commands (./namui/namui-type)	3m 24s
run-commands (./namui/namui-prebuilt)	5m 0s
post-namui-linux-host-x86_64-unknown-linux-gnu	1s
	1h 2m 56s

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