treewide: nix fmt

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

modules/lib/generators.nix

@@ -65,7 +65,6 @@
     let
       inherit (lib)
         concatStringsSep
-        splitString
         mapAttrsToList
         any
         ;

modules/misc/nix.nix

@@ -21,7 +21,6 @@ let
     isList
     isString
     literalExpression
-    maintainers
     mapAttrsToList
     mkDefault
     mkEnableOption

modules/programs/sm64ex.nix

@@ -8,27 +8,11 @@ let
   inherit (lib)
     literalExpression
     mkOption
-    optionalAttrs
     types
     ;
 
   cfg = config.programs.sm64ex;
 
-  # This is required for tests, we cannot overwrite the dummy package.
-  package =
-    if cfg.region == null && cfg.baserom == null && cfg.extraCompileFlags == null then
-      cfg.package
-    else
-      cfg.package.override (
-        attrs:
-        { }
-        // optionalAttrs (cfg.region != null) { region = cfg.region; }
-        // optionalAttrs (cfg.baserom != null) { baseRom = cfg.baserom; }
-        // optionalAttrs (cfg.extraCompileFlags != null) {
-          compileFlags = cfg.extraCompileFlags;
-        }
-      );
-
   mkConfig =
     key: value:
     let