support custom colors in constructor

src/ui/colorbutton.py

@@ -13,8 +13,6 @@ class ColorButton(QWidget):
         self.setSizePolicy(QSizePolicy(QSizePolicy.Policy.Fixed, QSizePolicy.Policy.Fixed))
         self.layout = QHBoxLayout(self)
 
-        self.color = color
-
         colors = {
             # red
             _('Strawberry Cream'): 'ff8080',
@@ -50,6 +48,8 @@ class ColorButton(QWidget):
             if color == color_name or color == color_value:
                 self.color_drop_down.setCurrentIndex(self.color_drop_down.count() - 1)
 
+        self.set_color(color)
+
         self.btn_color_picker = QPushButton(QIcon.fromTheme("color-picker"), "")
         self.layout.addWidget(self.btn_color_picker)
         self.btn_color_picker.pressed.connect(self._update_color)