run: Stop showing full GLib debug messages when not debugging

Currently when running an application, Builder enables all GLib debug messages, which means that it always spams the logs, which makes it hard to see actual printing inserted in work-in-progress code.

So this commit stops enabling debug messages with the Run button, but still shows them when running with the debugger, so there's still an easy way to see those.

Additionally, it's still possible to use the Runtime Environment section in the Build Preferences to enable those again.

Fixes #1270 (closed)

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