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egl: Don't free source error after propagating it

Sebastian Keller requested to merge skeller/mutter:fix-egl-query-device-string-crash into main 
local_error in meta_egl_query_device_string() is using g_autoptr,
meaning that it was getting freed after g_propagate_error(). This then
would result in error->message becoming invalid, causing crashes when
logging the error message later on.

This fixes a crash reported on Matrix: https://gist.github.com/retif/57add85aa2c90a3ecf2abf15451aef08 (The backtrace is missing debug symbols, but the content of the error message being logged clearly points to this being the issue)

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