mkFirefoxModule: remove visible option

Just default everything to show options to remove confusion / chance of
disabling documentation. We already set visible = true so it wasn't even
being used really.

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

modules/programs/firefox/mkFirefoxModule.nix

@@ -5,7 +5,6 @@
   wrappedPackageName ? null,
   unwrappedPackageName ? null,
   platforms,
-  visible ? false,
   enableBookmarks ? true,
 }:
 {
@@ -209,12 +208,10 @@ in
       example = true;
       description = ''
         Whether to enable ${appName}.${optionalString (description != null) " ${description}"}
-        ${optionalString (!visible) "See `${moduleName}` for more configuration options."}
       '';
     };
 
     package = mkOption {
-      inherit visible;
       type = with types; nullOr package;
       default = pkgs.${defaultPackageName};
       defaultText = literalExpression "pkgs.${packageName}";
@@ -317,7 +314,6 @@ in
     };
 
     nativeMessagingHosts = mkOption {
-      inherit visible;
       type = types.listOf types.package;
       default = [ ];
       description = ''
@@ -327,14 +323,12 @@ in
     };
 
     finalPackage = mkOption {
-      inherit visible;
       type = with types; nullOr package;
       readOnly = true;
       description = "Resulting ${appName} package.";
     };
 
     policies = lib.optionalAttrs (wrappedPackageName != null) (mkOption {
-      inherit visible;
       type = types.attrsOf jsonFormat.type;
       default = { };
       description = "[See list of policies](https://mozilla.github.io/policy-templates/).";
@@ -360,7 +354,6 @@ in
     };
 
     profiles = mkOption {
-      inherit visible;
       type = types.attrsOf (
         types.submodule (
           { config, name, ... }:
@@ -913,7 +906,6 @@ in
     };
 
     enableGnomeExtensions = mkOption {
-      inherit visible;
       type = types.bool;
       default = false;
       description = ''