root: remove the hack that disables the splash screen by default

Remove the hack that disables the splash screen by default, as this
has already been done in ROOT itself some time ago:
https://github.com/root-project/root/pull/4187

pkgs/applications/science/misc/root/default.nix

@@ -53,7 +53,6 @@
 , Cocoa
 , CoreSymbolication
 , OpenGL
-, noSplash ? false
 }:
 
 stdenv.mkDerivation rec {
@@ -143,8 +142,6 @@ stdenv.mkDerivation rec {
       -e '1iset(nlohmann_json_DIR "${nlohmann_json}/lib/cmake/nlohmann_json/")'
 
     patchShebangs build/unix/
-  '' + lib.optionalString noSplash ''
-    substituteInPlace rootx/src/rootx.cxx --replace "gNoLogo = false" "gNoLogo = true"
   '' + lib.optionalString stdenv.isDarwin ''
     # Eliminate impure reference to /System/Library/PrivateFrameworks
     substituteInPlace core/macosx/CMakeLists.txt \