reduce log noise

[quozl]

Some log lines aren't needed any more;

/usr/share/sugar/activities/Develop.activity/develop_app.py:22: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk
/usr/share/sugar/activities/Develop.activity/sourceview_editor.py:22: PyGIWarning: GtkSource was imported without specifying a version first. Use gi.require_version('GtkSource', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import GtkSource
1552001699.282932 CRITICAL root: finished initialization
1552001701.369851 ERROR root: WRITE_FILE