WM (Linux): fix wl-restart parsing (#1422)

Make the WM name in `wl-restart -n 5 Hyprland` parse as "Hyprland"
instead of "-n".

src/detection/displayserver/linux/wayland/wayland.c

@@ -39,7 +39,7 @@ static bool waylandDetectWM(int fd, FFDisplayServerResult* result)
         filename = result->wmProcessName.chars;
 
     if (ffStrEquals(filename, "wl-restart"))
-        ffStrbufSubstrAfterFirstC(&result->wmProcessName, '\0');
+        ffStrbufSubstrAfterLastC(&result->wmProcessName, '\0');
 
     ffStrbufSubstrBeforeFirstC(&result->wmProcessName, '\0'); //Trim the arguments
     ffStrbufSubstrAfterLastC(&result->wmProcessName, '/'); //Trim the path