Remove non-existent entry from tsconfig.json

Summary: ^

Reviewed By: aigoncharov

Differential Revision: D50304142

fbshipit-source-id: c1d0d06b30ebdf10b20341d926efbd6a8c8eaa63

desktop/tsconfig.base.json

@@ -24,7 +24,6 @@
       "flipper-plugin": ["./flipper-plugin/src"],
       "eslint-plugin-flipper": ["./eslint-plugin-flipper/src"],
       "flipper-server-core": ["./flipper-server-core/src"],
-      "flipper-server-ui": ["./flipper-server-ui/src"],
       "flipper-common": ["./flipper-common/src"],
       "flipper-*": ["./*/src"]
     },