Set UI theme color for Browser's count label and MenuBar's info label.

src/app/Browser.cpp

@@ -518,7 +518,6 @@ struct Browser : widget::OpaqueWidget {
 
 		countLabel = new ui::Label;
 		countLabel->box.size.x = 100;
-		countLabel->color.a = 0.5;
 		headerLayout->addChild(countLabel);
 
 		SortButton* sortButton = new SortButton;

src/app/MenuBar.cpp

@@ -996,6 +996,8 @@ struct MenuBar : widget::OpaqueWidget {
 	void step() override {
 		Widget::step();
 		infoLabel->box.size.x = box.size.x - infoLabel->box.pos.x - 5;
+		// Setting 50% alpha prevents Label from using the default UI theme color, so set the color manually here.
+		infoLabel->color = color::alpha(bndGetTheme()->regularTheme.textColor, 0.5);
 	}
 };