The Find Files window doesn't resize the scrollable view properly when the window is resized.

Steps to reproduce:
1. Open EasyTAG on a directory with some EasyTAG-editable files (it shouldn't matter what you pick, I used a folder of FLAC files) so there's some data to see and work with.
2. Press Ctrl-F or select Edit->Find... to bring up the Find Files window. The Find Files window appears and there's a scrollable view within this window showing filenames and other data.
3. Resize the Find Files window to be larger and notice how the window resizes but not the scrollable view within. That scrollable view remains the same size regardless of the size of the window.

I expected the scrollable view to be resized with the window size, showing me more or less of the data in that scrollable view in accordance with the size of the scrollable view (which should be tied to the size of the Find Files window).

I tested this on GNU/Linux but this might affect all users.