treewide: remove redundant quotes

pkgs/development/python-modules/numpy/default.nix

@@ -5,7 +5,7 @@ let
   cfg = writeTextFile {
     name = "site.cfg";
     text = (lib.generators.toINI {} {
-      "${blasImplementation}" = {
+      ${blasImplementation} = {
         include_dirs = "${blas}/include";
         library_dirs = "${blas}/lib";
       } // lib.optionalAttrs (blasImplementation == "mkl") {

pkgs/development/python-modules/spacy/models.nix

@@ -13,7 +13,7 @@ let
     meta = with stdenv.lib; {
       description = "Models for the spaCy NLP library";
       homepage    = "https://github.com/explosion/spacy-models";
-      license     = licenses."${license}";
+      license     = licenses.${license};
       maintainers = with maintainers; [ rvl ];
     };
   };