Incorrect validation message for flag fields

OpenXR bitfields are 64-bit, but the validation layer displays their value as 32-bit once it found an illegal value:

inline_flag_str += 'oss_enum << Uint32ToHexString(static_cast(%s%s));\n' % (pointer_string, full_param_name)

https://github.com/KhronosGroup/OpenXR-SDK-Source/blob/21714cf0ec46c67f2597d467a34a9004dbf380aa/src/scripts/validation_layer_generator.py#L1327

This results in confusing validation messages such as:

> [2026-01-30 18:47:25][VALID_ERROR|VUID-XrSwapchainCreateInfo-createFlags-parameter|xrCreateSwapchain]: XrSwapchainCreateInfo invalid member XrSwapchainCreateFlags "createFlags" flag value 0x00000000 contains illegal bit

Start in src/scripts/validation_layer_generator.py at line 1327, where the flag value is converted for the validation message. Trace the generated message path and verify that illegal 64-bit flag values retain their full value in the output. Done means the validation message no longer truncates OpenXR bitfields to 32 bits.

Written by the indexing model from the issue text.