Update projects.yml

Author: Phillip-signpath

docs/_data/projects.yml

@@ -1021,7 +1021,7 @@
   repository: github.com/GoldenPotato137/PotatoVN
   license: Apache-v2_0
 
-- id: promptx-desktop
+- id: Promptx-Desktop
   title: promptx-desktop
   category: productivity
   tagline: Leading AI Agent Context Platform - Chat is all you need