Qt: Fix DPI scaling 125% + higher quality icons

Upscaling on Qt didn't work properly as Windows calculates it differently, it's better to give far larger pictures and icons and let it downscale.

Also added most country flags that are relevant for PCSX2.

Reduces size icons from 3.5 MB to a whopping 0.34 MB (340 KB!) but looks even better for everyone.

Hopefully fixes #6255

pcsx2-qt/GameList/GameListModel.cpp

@@ -300,7 +300,7 @@ QVariant GameListModel::data(const QModelIndex& index, int role) const
 
 				case Column_Compatibility:
 				{
-					return m_compatibiliy_pixmaps[static_cast<int>(
+					return m_compatibility_pixmaps[static_cast<int>(
 						(static_cast<u32>(ge->compatibility_rating) >= GameList::CompatibilityRatingCount) ?
                             GameList::CompatibilityRating::Unknown :
                             ge->compatibility_rating)];
@@ -473,7 +473,7 @@ void GameListModel::loadCommonImages()
 	m_region_other_pixmap = QIcon(QStringLiteral(":/icons/flag-other.png")).pixmap(QSize(42, 30));
 
 	for (u32 i = 1; i < GameList::CompatibilityRatingCount; i++)
-		m_compatibiliy_pixmaps[i].load(QStringLiteral(":/icons/star-%1.png").arg(i - 1));
+		m_compatibility_pixmaps[i].load(QStringLiteral(":/icons/star-%1.png").arg(i - 1));
 
 	m_placeholder_pixmap.load(QString::fromStdString(Path::Combine(EmuFolders::Resources, "cover-placeholder.png")));
 }

pcsx2-qt/GameList/GameListModel.h

@@ -92,6 +92,6 @@ private:
 
 	QPixmap m_placeholder_pixmap;
 
-	std::array<QPixmap, static_cast<int>(GameList::CompatibilityRatingCount)> m_compatibiliy_pixmaps;
+	std::array<QPixmap, static_cast<int>(GameList::CompatibilityRatingCount)> m_compatibility_pixmaps;
 	mutable std::unordered_map<std::string, QPixmap> m_cover_pixmap_cache;
 };