nwjs: remove phases

pkgs/development/tools/node-webkit/nw12.nix

···
       "117gx6yjbcya64yg2vybcfyp591sid209pg8a33k9afbsmgz684c";
   };
 
-  phases = [ "unpackPhase" "installPhase" ];
-
   installPhase = ''
     mkdir -p $out/share/nwjs
     cp -R * $out/share/nwjs

pkgs/development/tools/nwjs/default.nix

···
       "0nlpdz76k1p1pq4xygfr2an91m0d7p5fjyg2xhiggyy8b7sp4964";
   };
 
-  phases = [ "unpackPhase" "installPhase" ];
-
   # we have runtime deps like sqlite3 that should remain
   dontPatchELF = true;