Qt/WinUpdater: Remove "Update Complete" dialog

Co-Authored-By: KamFretoZ <14798312+kamfretoz@users.noreply.github.com>

src/updater/win32_main.cpp

@@ -94,8 +94,6 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLi
 
   updater.CleanupStagingDirectory();
 
-  progress.ModalInformation("Update complete.");
-
   progress.DisplayFormattedInformation("Launching '%s'...",
                                        StringUtil::WideStringToUTF8String(program_to_launch).c_str());
   ShellExecuteW(nullptr, L"open", program_to_launch.c_str(), nullptr, nullptr, SW_SHOWNORMAL);