Fix -PKG Viewer -Button install

[DanielSvoboda]

issues 2112

[GHU7924]

I also wrote that the PKG Viewer does not see the PKG files. The PKG itself is not displayed, but the folder is added and the added is displayed in the PKG Viewer.

I can't select the entire folder with other folders containing PKG for multiple installations.

And if PKG can be added and installed, then why is there no way to remove PKG (not from the computer, but from shadPS4), and there is no way to clear this list?

And in the "file" section, rename "Open folder" to something like "Add a folder with PKG" (or something like that), and also add the "Close PKG Viewer" button for convenience (so that "Open" is not lonely XD).