Fix test break on non-spirv build (#5422)

A previous PR added this spriv option. The default should have been
false, but in the block that checks for spirv options on a non-spirv
build, the default was set to true. This broke testing on non-spirv
builds.

lib/DxcSupport/HLSLOptions.cpp

@@ -1120,7 +1120,7 @@ int ReadDxcOpts(const OptTable *optionTable, unsigned flagsToInclude,
       Args.hasFlag(OPT_Wno_vk_emulated_features, OPT_INVALID, false) ||
       Args.hasFlag(OPT_fvk_auto_shift_bindings, OPT_INVALID, false) ||
       Args.hasFlag(OPT_fvk_allow_rwstructuredbuffer_arrays, OPT_INVALID,
-                   true) ||
+                   false) ||
       !Args.getLastArgValue(OPT_fvk_stage_io_order_EQ).empty() ||
       !Args.getLastArgValue(OPT_fspv_debug_EQ).empty() ||
       !Args.getLastArgValue(OPT_fspv_extension_EQ).empty() ||