[WebGPU] [Style] Make lambdas in Modules/WebGPU adhere to the style guide
<rdar://problem/109589999>
Pull request: https://github.com/WebKit/WebKit/pull/14121
Committed 264303@main (25578b6a979e): <https://commits.webkit.org/264303@main> Reviewed commits have been landed. Closing PR #14121 and removing active labels.