Use qt

Suggestion from code review

Co-authored-by: Jakub Trllo <43494761+iLLiCiTiT@users.noreply.github.com>

openpype/tools/studio_tools/app.py

@@ -1,8 +1,8 @@
 import sys
 import os
-import PySide2.QtCore as QtCore
-import PySide2.QtWidgets as QtWidgets
-from pyblish_pype import util
+from Qt import QtCore
+from Qt import QtWidgets
+from openpype import style
 from openpype.settings import get_project_settings
 from openpype.tools.utils import lib as tools_lib
 
@@ -19,14 +19,7 @@ def __init__(self, parent=None):
  super(StudioToolsDialog, self).__init__(parent)
 
  self.resize(400, 300)
- with open(util.get_asset("app.css")) as f:
- css = f.read()
-
- # Make relative paths absolute
- root = util.get_asset("").replace("\\", "/")
- css = css.replace("url(\"", "url(\"%s" % root)
-
- self.setStyleSheet(css)
+ self.setStyleSheet(style.load_stylesheet())
 
  project_settings = get_project_settings(os.getenv("AVALON_PROJECT"))
  host = os.getenv("AVALON_APP")