don't override prompt

Signed-off-by: Demis Bellot <demis.bellot@gmail.com>

Author: mythz

AiServer/wwwroot/mjs/components/ImageToText.mjs

@@ -276,7 +276,7 @@ export default {
         watch(() => routes.id, updated)
 
         watch(() => [prefs.value.model], () => {
-            request.value.prompt = prefs.value.model
+            request.value.prompt = prefs.value.model && !request.value.prompt
                 ? 'Describe this image'
                 : ''
         })