Hide sampling method select from unsupported backends

public/scripts/extensions/stable-diffusion/settings.html

@@ -242,7 +242,7 @@
             </div>
 
             <div class="flex-container">
-                <div class="flex1">
+                <div class="flex1" data-sd-source="extras,horde,auto,drawthings,novel,vlad,comfy">
                     <label for="sd_sampler" data-i18n="Sampling method">Sampling method</label>
                     <select id="sd_sampler"></select>
                 </div>

src/endpoints/stable-diffusion.js

@@ -807,6 +807,8 @@ stability.post('/generate', jsonParser, async (request, response) => {
 
         const { payload, model } = request.body;
 
+        console.log('Stability AI request:', model, payload);
+
         const formData = new FormData();
         for (const [key, value] of Object.entries(payload)) {
             if (value !== undefined) {