runtime: config.in used undefined log level

[marcusmueller]

Description

As noticed by @argilo in #6673, this was a mistake. We shouldn't be using a log level string not defined in logger.cc.

Which blocks/areas does this affect?

logging!

Checklist

• I have read the CONTRIBUTING document.
• I have squashed my commits to have one significant change per commit.
• I have signed my commits before making this PR
• My code follows the code style of this project. See GREP1.md.
• I have updated the documentation where necessary.
• I have added tests to cover my changes, and all previous tests pass.

[argilo]

It looks like this should preserve compatibility, since both the old and new loggers accept crit:

gnuradio/gnuradio-runtime/lib/logger.cc

Lines 186 to 187 in fe1b359

	else if (nocase == "crit")
	logger_set_level(logger, log4cpp::Priority::CRIT);

gnuradio/gnuradio-runtime/lib/logger.cc

Lines 118 to 120 in 4d3eb9f

	} else if (level == "crit" || level == "alert" || level == "fatal" ||
	level == "emerg") {
	parsed_level = spdlog::level::critical;

[argilo]

@willcode This might be a good one to include in 3.10.9.2 as well. Gqrx users are continuing to run into this: gqrx-sdr/gqrx#1316