Allow bigger log file

[natsume42]

Issue

After observing an issue with cosmic-launcher/pop-launcher, pop-launcher.log file cannot be used for analysis, because it is empty.

Analysis

• 'init_logging()' (main.rs) resets log file, if it exceeds 1000 bytes.
• This limit gets easily exceeded already during startup of pop-launcher when log level is set to info/debug/trace.
• This cleanup logic gets executed whenever pop-launcher is started, which in turn happens whenever cosmic-launcher is hidden.
• As a net effect, log file gets emptied as soon as cosmic-launcher is hidden, basically deleting all logs of the last observed issue.

Solution Proposal

Until journald is used for logging, I would like to propose to at least increase the threshold value to some bigger value, like at least 1 MiB.