patchPpdFilesHook: share/ppds -> share/ppd

This was an oversight in commit
335a9083b0 .
The Wikipedia article referenced there
https://en.wikipedia.org/wiki/PostScript_Printer_Description#CUPS
clearly states that ppd file locations are
`/usr/share/ppd/` or `/usr/share/cups/model/`.
Even the version of that article
from that commit's time says so.
I don't know what dark force made me consistently
change that to `/usr/share/ppds/`.  *sigh*.

pkgs/by-name/pa/patchPpdFilesHook/patch-ppd-hook.sh

@@ -5,7 +5,7 @@ fixupOutputHooks+=(_patchPpdFileCommands4fixupOutputHooks)
 # Install a hook for the `fixupPhase`:
 # If the variable `ppdFileCommands` contains a list of
 # executable names, the hook calls `patchPpdFileCommands`
-# on each output's `/share/cups/model` and `/share/ppds`
+# on each output's `/share/cups/model` and `/share/ppd`
 # directories in order to replace calls to those executables.
 
 _patchPpdFileCommands4fixupOutputHooks () {
@@ -13,8 +13,8 @@ _patchPpdFileCommands4fixupOutputHooks () {
     if [[ -d $prefix/share/cups/model ]]; then
         patchPpdFileCommands "$prefix/share/cups/model" $ppdFileCommands
     fi
-    if [[ -d $prefix/share/ppds ]]; then
-        patchPpdFileCommands "$prefix/share/ppds" $ppdFileCommands
+    if [[ -d $prefix/share/ppd ]]; then
+        patchPpdFileCommands "$prefix/share/ppd" $ppdFileCommands
     fi
 }
 

pkgs/by-name/pa/patchPpdFilesHook/test.nix

@@ -33,10 +33,10 @@ stdenv.mkDerivation {
   ppdFileCommands = [ "cmp" ];
   preFixup = ''
     install -D "${input}" "${placeholder "out"}/share/cups/model/test.ppd"
-    install -D "${input}" "${placeholder "out"}/share/ppds/test.ppd"
+    install -D "${input}" "${placeholder "out"}/share/ppd/test.ppd"
   '';
   postFixup = ''
     diff --color --report-identical-files "${output}" "${placeholder "out"}/share/cups/model/test.ppd"
-    diff --color --report-identical-files "${output}" "${placeholder "out"}/share/ppds/test.ppd"
+    diff --color --report-identical-files "${output}" "${placeholder "out"}/share/ppd/test.ppd"
   '';
 }