Fix wrong buffer index on emitting wheel event #521

Job	Run time
list-projects	29s
run-commands (./namui/namui-hooks)	7m 22s
run-commands (./namui/namui)	8m 30s
run-commands (./namui/skia)	7m 11s
run-commands (./namui/namui-drawer)	7m 48s
run-commands (./namui/sample/rect)	8m 29s
run-commands (./namui/sample/register-font)	8m 30s
run-commands (./namui/sample/http)	8m 38s
run-commands (./namui/sample/media)	8m 46s
run-commands (./namui/sample/kv_store)	8m 26s
run-commands (./namui/sample/mouse)	8m 43s
run-commands (./namui/sample/typography-effect)	9m 3s
run-commands (./namui/sample/bundle)	8m 26s
run-commands (./namui/namui-type)	9m 23s
run-commands (./namui/namui-prebuilt)	9m 4s
post-namui-linux-host-x86_64-pc-windows-msvc	1s
	1h 58m 49s

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