Make --windowed available on all platform and make sure to trigger resize

Windows/main.cpp

@@ -564,9 +564,6 @@ int WINAPI WinMain(HINSTANCE _hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLin
 				break;
 			}
 
-			if (wideArgs[i] == L"--windowed")
-				g_Config.bFullScreen = false;
-
 			if (wideArgs[i].find(gpuBackend) != std::wstring::npos && wideArgs[i].size() > gpuBackend.size()) {
 				const std::wstring restOfOption = wideArgs[i].substr(gpuBackend.size());