LibGUI+LibGfx: Add Tray ColorRole helpers to Palette

Userland/Libraries/LibGUI/Tray.cpp

@@ -102,7 +102,7 @@ void Tray::paint_event(GUI::PaintEvent& event)
         }
 
         auto const& font = is_checked ? this->font().bold_variant() : this->font();
-        painter.draw_text(text_rect, item.text, font, Gfx::TextAlignment::CenterLeft, palette().color(Gfx::ColorRole::TrayText));
+        painter.draw_text(text_rect, item.text, font, Gfx::TextAlignment::CenterLeft, palette().tray_text());
     }
 }
 

Userland/Libraries/LibGfx/Palette.h

@@ -117,6 +117,8 @@ public:
     Color ruler_inactive_text() const { return color(ColorRole::RulerInactiveText); }
     Color text_cursor() const { return color(ColorRole::TextCursor); }
     Color focus_outline() const { return color(ColorRole::FocusOutline); }
+    Color tray() const { return color(ColorRole::Tray); }
+    Color tray_text() const { return color(ColorRole::TrayText); }
 
     Color link() const { return color(ColorRole::Link); }
     Color active_link() const { return color(ColorRole::ActiveLink); }