Fixed bug in 'IsEnabled' check. Was hardcoded to DebugLevel rather than using the log level provided in the parameter.

In LibLog vs.1.4, there is a bug for the SerilogProvider. If one configure minimum log level to e.g. Info, then none of the log events logged with Info() or above will be logged. This is due to the check always being checked with DebugLevel rather than the provided LogLevel. The fix is very simple. Please see the code.

I've also added tests for bug.

Thanks for providing LibLog.

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