[llvm] [libsycl][Unit][NFC] Fix another unused capture warning (PR #217941)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- libsycl/unittests/mock/helpers.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libsycl/unittests/mock/helpers.cpp b/libsycl/unittests/mock/helpers.cpp
index 0f139c722..5a351521d 100644
--- a/libsycl/unittests/mock/helpers.cpp
+++ b/libsycl/unittests/mock/helpers.cpp
@@ -310,8 +310,8 @@ void mock::MockLiboffload::initDefault() {
       });
   ON_CALL(*this, olMemPrefetch)
       .WillByDefault([](ol_queue_handle_t Queue, size_t Count,
-                            const void **Mems, const size_t *Sizes,
-                            ol_mem_migration_flags_t Flags) -> ol_result_t {
+                        const void **Mems, const size_t *Sizes,
+                        ol_mem_migration_flags_t Flags) -> ol_result_t {
         EXPECT_NE(Queue, nullptr);
         EXPECT_EQ(Count, 1);
         EXPECT_NE(Mems, nullptr);

``````````

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https://github.com/llvm/llvm-project/pull/217941