WebGPU::ShaderModule::convertCheckResult() should use std::forward

<https://webkit.org/b/241437>
<rdar://94662366>

Reviewed by Darin Adler.

* Source/WebGPU/WebGPU/ShaderModule.mm:
(WebGPU::ShaderModule::convertCheckResult):
- Switch from WTFMove() to std::forward().

Canonical link: https://commits.webkit.org/251415@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295409 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebGPU/WebGPU/ShaderModule.mm

@@ -122,7 +122,7 @@
 auto ShaderModule::convertCheckResult(std::variant<WGSL::SuccessfulCheck, WGSL::FailedCheck>&& checkResult) -> CheckResult
 {
     return WTF::switchOn(WTFMove(checkResult), [](auto&& check) -> CheckResult {
-        return WTFMove(check);
+        return std::forward<decltype(check)>(check);
     });
 }