Fix double-parsing of process config

Summary: This had been there for way too long.

Reviewed By: mweststrate

Differential Revision: D18834089

fbshipit-source-id: 563aa04876910a7544a7f62865b146b933dbf570

src/utils/argvUtils.tsx

@@ -9,10 +9,9 @@
 
 import electron from 'electron';
 import isProduction from './isProduction';
+import processConfig from './processConfig';
 
 export const isAutoUpdaterEnabled = () =>
-  // TODO(T39788540): Centralise config access and avoid parsing multiple times.
-  JSON.parse(electron.remote.process.env.CONFIG || process.env.CONFIG || '{}')
-    .updaterEnabled &&
+  processConfig().updaterEnabled &&
   isProduction() &&
   process.platform === 'darwin';