[widgets] Move resources initialization in widgets

This allows to make the resources properly available also for
testing.

beat/editor/scripts/editor_cli.py

@@ -55,7 +55,6 @@ from ..backend.asset import AssetType
 from ..backend.asset import Asset
 from ..backend.eventfilters import MouseWheelFilter
 
-from .. import resources  # noqa Qt resources system, only import is needed
 from .. import version
 
 global logger

beat/editor/widgets/__init__.py

@@ -22,3 +22,5 @@
 # with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
 #                                                                             #
 ###############################################################################
+
+from .. import resources  # noqa Qt resources system, only import is needed