davinci-resolve-studio: Automatically create license dir

Only needed for studio variant. Previously, `extraPreBwrapCmds` did not
exist. Now that it does, we can use it. See message in commit
fe45cd375a for context.

pkgs/applications/video/davinci-resolve/default.nix

@@ -232,6 +232,10 @@ buildFHSEnv {
     zlib
   ];
 
+  extraPreBwrapCmds = lib.optionalString studioVariant ''
+    mkdir -p ~/.local/share/DaVinciResolve/license || exit 1
+  '';
+
   extraBwrapArgs = lib.optionals studioVariant [
     "--bind \"$HOME\"/.local/share/DaVinciResolve/license ${davinci}/.license"
   ];