Change: Move baseset missing/corrupted files label to list item. (#11455)

This allows any baseset error to be displayed in the drop down list so it is more easily visible, and avoids wasted space in the layout.

src/base_media_base.h

@@ -121,6 +121,21 @@ struct BaseSet {
 		return this->description.at(std::string{});
 	}
 
+	/**
+	 * Get string to use when listing this set in the settings window.
+	 * If there are no invalid files, then this is just the set name,
+	 * otherwise a string is formatted including the number of invalid files.
+	 * @return the string to display.
+	 */
+	std::string GetListLabel() const
+	{
+		if (this->GetNumInvalid() == 0) return this->name;
+
+		SetDParamStr(0, this->name);
+		SetDParam(1, this->GetNumInvalid());
+		return GetString(STR_BASESET_STATUS);
+	}
+
 	/**
 	 * Calculate and check the MD5 hash of the supplied file.
 	 * @param file The file get the hash of.