[Fixed] Website fixing - IrfanView Portable

On the IrfanView Portable page, the following text can now be removed, since we have the plugins available in PAF form.

IrfanView Plugins: You can download a zipped version of IrfanView Plugins to add features and functionality to IrfanView Portable. Just unzip the files to IrfanViewPortable\App\IrfanView\Plugins.