pqiv: Set max-depth to 0

Fixes an issue where the latest version of pqiv would become
unresponsive when browsing images in directories with large
subdirectories. Also makes selecting multiple images work again.

See: https://github.com/phillipberndt/pqiv/pull/204

home/pqiv.nix

@@ -7,6 +7,7 @@
         lazy-load = 1;
         hide-info-box = 1;
         scale-mode-screen-fraction = 1;
+        max-depth = 0;
         background-pattern = "black";
         disable-backends = "archive,archive_cbx,libav,poppler,spectre";
         thumbnail-size = "256x256";