[widgets][dataformateditor] Make sub editors QGroupBox

This makes their grouping clearer

beat/editor/widgets/dataformateditor.py

@@ -37,7 +37,6 @@ from PyQt5.QtWidgets import QMenu
 from PyQt5.QtWidgets import QPushButton
 from PyQt5.QtWidgets import QSpinBox
 from PyQt5.QtWidgets import QVBoxLayout
-from PyQt5.QtWidgets import QWidget
 
 from ..backend.asset import AssetType
 from ..backend.assetmodel import DataFormatModel
@@ -95,7 +94,7 @@ def default_object_dataformat():
     return {QCoreApplication.translate("Dataformat", "Change_me"): default_dataformat()}
 
 
-class DataformatBaseWidget(QWidget):
+class DataformatBaseWidget(QGroupBox):
     """Base widget to build the various 'sub-editors'"""
 
     nameChanged = pyqtSignal()