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js: Hide type menu if there's only one preset and no configuration

It seems a bit silly to display it when there's only one option.

--- a/emcc.c

+++ b/emcc.c

@@ -976,6 +976,7 @@

     {

         struct preset_menu *menu = midend_get_presets(me, &npresets);

         char *env;

+        bool may_configure = false;

         presets = snewn(npresets, game_params *);

         for (i = 0; i < npresets; i++)

             presets[i] = NULL;

@@ -990,9 +991,11 @@

         if (thegame.can_configure &&

             (!env || env[0] == 'y' || env[0] == 'Y'))

+            may_configure = true;

+        if (may_configure)

             js_add_preset(0, "Custom...", -1);

-        have_presets_dropdown = npresets > 0 || thegame.can_configure;

+        have_presets_dropdown = npresets > 1 || may_configure;

         if (have_presets_dropdown)

             /*

--- a/emccpre.js

+++ b/emccpre.js

@@ -614,7 +614,7 @@

         // Key to open the menu on KaiOS.

         if ((event.key == "SoftRight" || event.key == "F10") &&

             !menuform.contains(document.activeElement)) {

-            menuform.querySelector("li div").focus();

+            menuform.querySelector("li div, li button").focus();

             event.preventDefault();

             event.stopPropagation();

         }