SL-18721 Shutdown fixes #3

Fix dialog box being blank in task bar

indra/llwindow/llwindowwin32.cpp

@@ -3657,6 +3657,9 @@ void LLSplashScreenWin32::showImpl()
 		NULL,	// no parent
 		(DLGPROC) LLSplashScreenWin32::windowProc); 
 	ShowWindow(mWindow, SW_SHOW);
+
+    // Should set taskbar text without creating a header for the window (caption)
+    SetWindowTextA(mWindow, "Second Life");
 }