Fix: Steam tray icon visibility in dark mode

[IcEarthlight]

Problem

The Steam tray icon will not change its color in dark mode, making it nearly invisible against the dark taskbar background. Other icons (e.g., sound, Wi-Fi, Bluetooth) adapt correctly to light/dark themes.

Possible Cause

The original Steam SVG lacks a <style> definition and uses a hardcoded fill color, unlike other icons which use currentColor and the ColorScheme-Text class.

Fix

I modified 32/status/steam_tray_mono.svg to something like:

<style id="current-color-scheme" type="text/css">
  .ColorScheme-Text { color: #363636; }
</style>
<path class="ColorScheme-Text" d="..." fill="currentColor" opacity=".85"/>

This allows the icon to adapt properly to both light and dark modes.