nixos: remove qtPlugins and gtkPlugins

Both Qt and GTK load plugins from the active profiles
automatically, so it is sufficient to install input methods
system-wide. Overriding the plugin paths may interfere with correct
operation of other plugins.

nixos/modules/i18n/inputMethod/fcitx.nix

@@ -29,8 +29,6 @@ in
 
   config = mkIf (config.i18n.inputMethod.enabled == "fcitx") {
     environment.systemPackages = [ fcitxPackage ];
-    gtkPlugins = [ fcitxPackage ];
-    qtPlugins  = [ fcitxPackage ];
 
     environment.variables = {
       GTK_IM_MODULE = "fcitx";

nixos/modules/i18n/inputMethod/nabi.nix

@@ -4,7 +4,6 @@ with lib;
 {
   config = mkIf (config.i18n.inputMethod.enabled == "nabi") {
     environment.systemPackages = [ pkgs.nabi ];
-    qtPlugins  = [ pkgs.nabi ];
 
     environment.variables = {
       GTK_IM_MODULE = "nabi";

nixos/modules/i18n/inputMethod/uim.nix

@@ -23,8 +23,6 @@ in
 
   config = mkIf (config.i18n.inputMethod.enabled == "uim") {
     environment.systemPackages = [ pkgs.uim ];
-    gtkPlugins = [ pkgs.uim ];
-    qtPlugins  = [ pkgs.uim ];
 
     environment.variables = {
       GTK_IM_MODULE = "uim";