[MM-40233] Swap names for dark/light tray icons on Linux and Windows (#2180)

* Swap names for dark/light tray icons for linux and windows.

* Swap icon tray themes when system default is used

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

src/main/tray/tray.ts

@@ -19,7 +19,7 @@ let lastMessage = app.name;
 
 /* istanbul ignore next */
 export function refreshTrayImages(trayIconTheme: string) {
-    const systemTheme = nativeTheme.shouldUseDarkColors ? 'dark' : 'light';
+    const systemTheme = nativeTheme.shouldUseDarkColors ? 'light' : 'dark';
     const winTheme = trayIconTheme === 'use_system' ? systemTheme : trayIconTheme;
 
     switch (process.platform) {