fix prefXCloud logo bug (#1933)

### What problem does this PR solve?

fix prefXCloud logo bug

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

web/src/pages/user-setting/setting-model/constant.ts

   cohere: 'cohere',
   Lepton: 'lepton',
   TogetherAI:'together-ai',
-  PerfXCould: 'perfx-could',
+  PerfXCould: 'perfx-cloud',
   Upstage: 'upstage',
   "novita.ai": 'novita-ai',
   "SILICONFLOW": 'siliconflow'