Use a 1-arg static_assert since we already use it elsewhere

PiperOrigin-RevId: 546896012
Change-Id: I3c05dd41e4e1ef620e1ed41b705105daf00b2808
diff --git a/support/internal/offsetof_test.cc b/support/internal/offsetof_test.cc
index c746025..2b2994e 100644
--- a/support/internal/offsetof_test.cc
+++ b/support/internal/offsetof_test.cc
@@ -22,9 +22,7 @@
   T2 t2;
 };
 
-static_assert(CRUBIT_OFFSET_OF(t1, TemplateWithTwoArgs<int64_t, int32_t>) == 0,
-              "");
-static_assert(CRUBIT_OFFSET_OF(t2, TemplateWithTwoArgs<int64_t, int32_t>) == 8,
-              "");
+static_assert(CRUBIT_OFFSET_OF(t1, TemplateWithTwoArgs<int64_t, int32_t>) == 0);
+static_assert(CRUBIT_OFFSET_OF(t2, TemplateWithTwoArgs<int64_t, int32_t>) == 8);
 
 }  // namespace crubit