Update appdata for next RC

(cherry picked from commit a2c59cf87f)
Signed-off-by: phosit <phosit@autistici.org>

build/resources/0ad.appdata.xml

@@ -40,7 +40,7 @@
   <url type="translate">https://gitea.wildfiregames.com/0ad/0ad/wiki/Localization</url>
   <url type="donation">https://play0ad.com/community/donate/</url>
   <releases>
-    <release version="0.28.0" date="2026-02-05">
+    <release version="0.28.0" date="2026-02-16">
         <url type="details">https://play0ad.com/new-release-0-a-d-release-28-boiorix/</url>
         <description>
             <p>Wildfire Games proudly announces the release of 0 A.D. 0.28.0: "Boiorix".</p>

source/tools/atlas/AtlasUI/ScenarioEditor/Sections/Terrain/Terrain.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -344,7 +344,6 @@ public:
 	{
 		m_ScrolledPanel = new wxScrolledWindow(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxVSCROLL);
 		m_ScrolledPanel->SetScrollRate(0, 10);
-		m_ScrolledPanel->SetBackgroundColour(wxColor(255, 255, 255));
 
 		wxSizer* sizer = new wxBoxSizer(wxVERTICAL);
 		sizer->Add(m_ScrolledPanel, wxSizerFlags().Proportion(1).Expand());