Client: default log flags not set at startup

[RichardHaselgrove]

Describe the bug
When the optional file cc_config.xml is absent, the three default log flags (file_xfer, sched_ops, task) remain unset.
If cc_config.xml is present, but no log flags are mentioned in it, the defaults are set.

Steps To Reproduce

1. Delete or rename cc_config.xml
2. Restart client
3. View Event log.

Expected behavior
Default values should be set, as before.

System Information

• OS: Windows 7,10
• BOINC Version: 7.16.5 (new in v7.16)

Additional context
Defaults should be set at https://github.com/BOINC/boinc/blob/master/lib/cc_config.cpp#L42

This code was modified on 5 Nov 2019 by 219a540

[RichardHaselgrove]

I can't make this work, but setting the default values in the STRUCT definition

struct LOG_FLAGS {
    // If you add anything, you must add it to parse() and write()

    // on by default; intended for all users
    //
    bool file_xfer = true;
        // file transfer start and finish
    bool sched_ops = true;
        // interactions with schedulers
    bool task = true;
        // task start and finish, and suspend/resume

does at least put the right message out at startup.

[RichardHaselgrove]

Now being addressed by client: initialize log flags to tasks, sched_ops, file_xfer #3643