wgpu: Fix line vertex attribute layout. #184

Job	Run time
miri	2m 38s
no_std	46s
build (ubuntu, stable, locked, true)	1h 9m 21s
build (windows, stable, locked, false)	30m 47s
build (macos, stable, locked, false)	20m 57s
build (ubuntu, nightly, locked, false)	34m 57s
build (ubuntu, beta, locked, false)	47m 6s
build (ubuntu, stable, latest, false)	56m 16s
build (ubuntu, stable, minimal, false)	52m 58s
fuzz	19m 9s
deploy	5s
	5h 35m 0s

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