fix: Enable lowering log level below startup value

[sgasse]

Logger::parse_filters allows to change the log filter even after the logger has been initialized. However, it was not possible to see logs which were above the level set at startup. E.g. if the logger was initialized with debug, setting it to trace at runtime did not work since the filter of the global logging facade filtered out the trace logs.

This commit fixes the issue by calling log::set_max_level with the level from the updated log filter.

[sgasse]

I tested the fix on an android target with this small binary:

[package]
name = "logger_level"
version = "0.1.0"
edition = "2021"

[dependencies]
android-logd-logger = { path = "../android-logd-logger" }
log = "0.4.22"

use std::io::stdin;

use log::{debug, error, info, trace, warn};

fn main() {
    let mut logger = android_logd_logger::builder()
        .parse_filters("info")
        .prepend_module(true)
        .init();

    let mut log_filter = String::with_capacity(5);
    let mut counter = 0;

    println!("Enter a log level like trace, info etc.");

    loop {
        log_filter.clear();

        stdin().read_line(&mut log_filter).unwrap();
        logger.parse_filters(&log_filter);

        counter += 1;

        trace!("{counter}");
        debug!("{counter}");
        info!("{counter}");
        warn!("{counter}");
        error!("{counter}");
    }
}

The logger is initialized with the info level as max level. As expected, setting it to debug or trace does not lead to debug or trace logs without the fix: The filter in the logger is updated, but the logging facade still filters out everything above info.

With the fix, the debug and trace logs show up if the level is later set to trace although it was initialized with info.

[flxo]

LGTM! Thanks!