spirv-fuzz: Use an irrelevant id for the unused components (#3810)

Fixes #3808.
diff --git a/source/fuzz/fuzzer_pass_add_image_sample_unused_components.cpp b/source/fuzz/fuzzer_pass_add_image_sample_unused_components.cpp
index 313bb0d..3095bb6 100644
--- a/source/fuzz/fuzzer_pass_add_image_sample_unused_components.cpp
+++ b/source/fuzz/fuzzer_pass_add_image_sample_unused_components.cpp
@@ -184,7 +184,7 @@
          // FindOrCreateZeroConstant
          // %20 = OpConstant %4 0
          // %21 = OpConstantComposite %5 %20 %20
-         FindOrCreateZeroConstant(zero_constant_type_id, false)},
+         FindOrCreateZeroConstant(zero_constant_type_id, true)},
         MakeInstructionDescriptor(GetIRContext(), instruction),
         coordinate_with_unused_components_id));