in_winevtlog: Use correct flag for EvtRender

[mkfrey]

Fix the flags argument of one of the calls to EvtRender. It's currently using a value of the EVT_RENDER_CONTEXT_FLAGS enum, which contains flags for creating the render context. This commit replaces it with the correct flag of the enum EVT_RENDER_FLAGS, which is also used on the prior call to determine the buffer size.

Since both enum values are 0, this minor mistake is unlikely to have caused any issues.

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Testing
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Backporting

• [N/A] Backport to latest stable release.

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[cosmo0920]

Good catch! Thanks for your confirmation and fixing.