USRP lib: fix incorrect config check for time_source fallback

Guido Casatirequested to merge
fix-usrp-lib-time-source into develop

Corrected a logic bug in usrp_lib.cpp where the code mistakenly checked openair0_cfg[0].clock_source instead of time_source when a time_source was already specified in usrp_args.

Also improved the warning log to clarify that the config value is being ignored in favor of the explicit user-provided usrp_args.

Co-authored-by: Alexandre Serio alexandre.j.serio@altice.pt

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