Use ROOT_PATH constant instead of dynamic compute

sohstationviewer/view/db_config/value_color_helper/value_color_widget.py

@@ -8,6 +8,7 @@ from PySide6 import QtWidgets, QtGui, QtCore
 from PySide6.QtCore import Qt
 from PySide6.QtWidgets import QWidget, QDialog, QTextEdit
 
+from sohstationviewer.conf.constants import ROOT_PATH
 from sohstationviewer.view.db_config.value_color_helper.\
     edit_value_color_dialog import EditValueColorDialog
 from sohstationviewer.view.db_config.value_color_helper.\
@@ -56,12 +57,10 @@ class ValueColorEdit(QTextEdit):
 
         self.edit_button = QtWidgets.QToolButton(self)
         self.edit_button.setCursor(Qt.PointingHandCursor)
-        current_file_path = os.path.abspath(__file__)
-        root_path = Path(current_file_path).parent.parent.parent.parent
         if background == 'B':
-            img_file = f"{root_path}/images/edit_icon_black_background.png"
+            img_file = f"{ROOT_PATH}/images/edit_icon_black_background.png"
         else:
-            img_file = f"{root_path}/images/edit_icon_white_background.png"
+            img_file = f"{ROOT_PATH}/images/edit_icon_white_background.png"
         self.edit_button.setIcon(QtGui.QIcon(img_file))
         self.edit_button.setStyleSheet(
             "background: transparent; border: none;")