pcmanfm: move to applications/file-managers

pkgs/top-level/all-packages.nix

···
     inherit (darwin.apple_sdk.frameworks) IOKit;
   };
 
-  pcmanfm = callPackage ../applications/misc/pcmanfm { };
+  pcmanfm = callPackage ../applications/file-managers/pcmanfm { };
 
   pcmanfm-qt = lxqt.pcmanfm-qt;