ksmoothdock: qt514 -> qt515 (fix build)

pkgs/applications/misc/ksmoothdock/default.nix

···
       url = "https://github.com/dangvd/ksmoothdock/commit/00799bef8a1c1fe61ef9274866267d9fe9194041.patch";
       sha256 = "1nmb7gf1ggzicxz8k4fd67xhwjy404myqzjpgjym66wqxm0arni4";
     })
+    # Pull request to fix build on Qt 5.15 https://github.com/dangvd/ksmoothdock/pull/123
+    (fetchpatch {
+      url = "https://github.com/dangvd/ksmoothdock/commit/259527aacadb0fd9110d4425b9bf41a15bedce72.patch";
+      sha256 = "12nj58v9qqrynarn3gpywih3w27mr4n51z1b8mh0rfbnd2kib8dc";
+    })
   ];
 
   nativeBuildInputs = [ cmake extra-cmake-modules ];

pkgs/top-level/all-packages.nix

···
 
   peruse = libsForQt5.callPackage ../tools/misc/peruse { };
 
-  ksmoothdock = libsForQt514.callPackage ../applications/misc/ksmoothdock { };
+  ksmoothdock = libsForQt5.callPackage ../applications/misc/ksmoothdock { };
 
   kstars = libsForQt514.callPackage ../applications/science/astronomy/kstars { };