Clean up globals

Summary: This diff is some boyscouting on cleaning up our globals, and stop using them inconsistently icmw global or window

Reviewed By: aigoncharov

Differential Revision: D33171108

fbshipit-source-id: 400893e5f31523631a7ab6fda428524c751901f1

desktop/flipper-server-core/src/comms/ServerController.tsx

@@ -58,7 +58,7 @@ type ClientCsrQuery = {
   csr_path?: string | undefined;
 };
 
-declare interface ServerController {
+interface ServerController {
   on(event: 'error', callback: (err: Error) => void): this;
 }