style(test): clang-format (void) cast in ConfigureMultimodalTask EXPECT_THROW

The two configure_multimodal_task_impl EXPECT_THROW tests merged from
PR #249 used "(void) configure_..." with a space after the cast, which
the pinned clang-format 22.1.5 rejects (wants "(void)configure_..."),
reddening the C++ format CI check. Reformat with the pinned version; no
other files drift.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WfCPxFtiVbUD7Y3C9drQEz

Author: claude

src/test/cpp/test_jni_helpers.cpp

@@ -608,12 +608,12 @@ TEST(ConfigureMultimodalTask, MovesPromptAndMediaToCliTask) {
 
 TEST(ConfigureMultimodalTask, MediaWithoutProjectorThrows) {
     server_task task(SERVER_TASK_TYPE_COMPLETION);
-    EXPECT_THROW((void) configure_multimodal_task_impl(task, false, {{"prompt", "<__media__>"}}, {{0x01}}),
+    EXPECT_THROW((void)configure_multimodal_task_impl(task, false, {{"prompt", "<__media__>"}}, {{0x01}}),
                  std::invalid_argument);
 }
 
 TEST(ConfigureMultimodalTask, NonStringPromptThrows) {
     server_task task(SERVER_TASK_TYPE_COMPLETION);
-    EXPECT_THROW((void) configure_multimodal_task_impl(task, true, {{"prompt", json::array({1, 2})}}, {{0x01}}),
+    EXPECT_THROW((void)configure_multimodal_task_impl(task, true, {{"prompt", json::array({1, 2})}}, {{0x01}}),
                  std::invalid_argument);
 }